examples.go

// DO NOT MODIFY - Automatically generated from ./files/examples.txt

package main


import "fmt"

const (
    examples = `

Examples

Each example mailsend-go command is a single line. In Unix back slash  
can be used to continue in the next line. Also in Unix, use single
quotes instead of double quotes, otherwise if input has any shell
character like $ etc, it will get expanded by the shell. The directory
test/ has some test scripts.

Show SMTP server information

StartTLS will be used if server supports it

      mailsend-go -info -smtp smtp.gmail.com -port 587

    [S] 220 smtp.gmail.com ESMTP k185-v6sm17739711qkd.27 - gsmtp
    [C] HELO localhost
    [C] EHLO localhost
    [S] 250-smtp.gmail.com at your service, [x.x.x.x]
    [S] 250-SIZE 35882577
    [S] 250-8BITMIME
    [S] 250-STARTTLS
    [S] 250-ENHANCEDSTATUSCODES
    [S] 250-PIPELINING
    [S] 250-CHUNKING
    [S] 250-SMTPUTF8
    [C] STARTTLS
    [S] 220-2.0.0 Ready to start TLS
    [C] EHLO localhost
    [S] 250-smtp.gmail.com at your service, [x.x.x.x]
    [S] 250-SIZE 35882577
    [S] 250-8BITMIME
    [S] 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
    [S] 250-ENHANCEDSTATUSCODES
    [S] 250-PIPELINING
    [S] 250-CHUNKING
    [S] 250-SMTPUTF8
    Certificate of smtp.gmail.com:
     Version: 3 (0x3)
     Serial Number: 149685795415515161014990164765 (0x1e3a9301cfc7206383f9a531d)
     Signature Algorithm: SHA256-RSA
     Subject: CN=Google Internet Authority G3,O=Google Trust Services,C=US
     Issuer: GlobalSign
     Not before: 2017-06-15 00:00:42 +0000 UTC
     Not after: 2021-12-15 00:00:42 +0000 UTC
    [C] QUIT
    [S] 221-2.0.0 closing connection k185-v6sm17739711qkd.27 - gsmtp

Use SSL. Note the port is different

      mailsend-go -info -smtp smtp.gmail.com -port 465 -ssl

Print SMTP server certificate chain

      mailsend-go -info -smtp smtp.gmail.com -port 587 -printCerts

    [S] 220 smtp.gmail.com ESMTP 6a1803df08f44-80166e2f32bsm34741116d6.41 - gsmtp
    [C] HELO localhost
    [C] EHLO localhost
    [S] 250-smtp.gmail.com at your service, [x.x.x.x]
    [S] 250-SIZE 35882577
    [S] 250-8BITMIME
    [S] 250-STARTTLS
    [S] 250-ENHANCEDSTATUSCODES
    [S] 250-PIPELINING
    [S] 250-CHUNKING
    [S] 250-SMTPUTF8
    [C] STARTTLS
    [S] 220-2.0.0 Ready to start TLS
    [C] EHLO localhost
    [S] 250-smtp.gmail.com at your service, [x.x.x.x]
    [S] 250-SIZE 35882577
    [S] 250-8BITMIME
    [S] 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
    [S] 250-ENHANCEDSTATUSCODES
    [S] 250-PIPELINING
    [S] 250-CHUNKING
    [S] 250-SMTPUTF8
    [C] QUIT
    [S] 221-2.0.0 closing connection 6a1803df08f44-80166e2f32bsm34741116d6.41 - gsmtp

    === TLS Connection Information ===
    TLS Version: TLS 1.3
    Cipher Suite: 0x1301
    Server Name: smtp.gmail.com
    Negotiated Protocol:

    Certificate Chain (3 certificates):

    --- Certificate 1 ---
    Subject: CN=smtp.gmail.com
    Issuer: CN=WR2,O=Google Trust Services,C=US
    Serial Number: 14461562026188826353951632455228095006
    Not Before: 2025-09-08T08:36:45Z
    Not After: 2025-12-01T08:36:44Z
    Is CA: false
    DNS Names: smtp.gmail.com
    Key Usage: Digital Signature
    Status: Valid

    --- Certificate 2 ---
    Subject: CN=WR2,O=Google Trust Services,C=US
    Issuer: CN=GTS Root R1,O=Google Trust Services LLC,C=US
    Serial Number: 170058220837755766831192027518741805976
    Not Before: 2023-12-13T09:00:00Z
    Not After: 2029-02-20T14:00:00Z
    Is CA: true
    Key Usage: Digital Signature, Certificate Sign, CRL Sign
    Status: Valid

    --- Certificate 3 ---
    Subject: CN=GTS Root R1,O=Google Trust Services LLC,C=US
    Issuer: CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE
    Serial Number: 159159747900478145820483398898491642637
    Not Before: 2020-06-19T00:00:42Z
    Not After: 2028-01-28T00:00:42Z
    Is CA: true
    Key Usage: Digital Signature, Certificate Sign, CRL Sign
    Status: Valid

    --- Certificate Fingerprints (Leaf) ---
    SHA-1: 28:88:45:90:10:20:88:BA:87:2E:0E:7C:3A:12:D6:35:EC:26:AE:90
    SHA-256: 6F:F8:E2:F5:D4:AE:5A:FF:92:4A:5F:AC:88:80:14:3A:30:33:7A:CF:EE:33:94:82:EF:2A:93:47:80:E4:18:EF
    =====================================

       mailsend-go -info -smtp smtp.gmail.com -port 465 -ssl -printCerts

    [S] 220 smtp.gmail.com ESMTP 6a1803df08f44-80166781d27sm35134546d6.45 - gsmtp
    [C] HELO localhost
    [C] EHLO localhost
    [S] 250-smtp.gmail.com at your service, [x.x.x.x]
    [S] 250-SIZE 35882577
    [S] 250-8BITMIME
    [S] 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
    [S] 250-ENHANCEDSTATUSCODES
    [S] 250-PIPELINING
    [S] 250-CHUNKING
    [S] 250-SMTPUTF8
    [C] QUIT
    [S] 221-2.0.0 closing connection 6a1803df08f44-80166781d27sm35134546d6.45 - gsmtp

    === TLS Connection Information ===
    TLS Version: TLS 1.3
    Cipher Suite: 0x1301
    Server Name: smtp.gmail.com
    Negotiated Protocol:

    Certificate Chain (3 certificates):

    --- Certificate 1 ---
    Subject: CN=smtp.gmail.com
    Issuer: CN=WR2,O=Google Trust Services,C=US
    Serial Number: 14461562026188826353951632455228095006
    Not Before: 2025-09-08T08:36:45Z
    Not After: 2025-12-01T08:36:44Z
    Is CA: false
    DNS Names: smtp.gmail.com
    Key Usage: Digital Signature
    Status: Valid

    --- Certificate 2 ---
    Subject: CN=WR2,O=Google Trust Services,C=US
    Issuer: CN=GTS Root R1,O=Google Trust Services LLC,C=US
    Serial Number: 170058220837755766831192027518741805976
    Not Before: 2023-12-13T09:00:00Z
    Not After: 2029-02-20T14:00:00Z
    Is CA: true
    Key Usage: Digital Signature, Certificate Sign, CRL Sign
    Status: Valid

    --- Certificate 3 ---
    Subject: CN=GTS Root R1,O=Google Trust Services LLC,C=US
    Issuer: CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE
    Serial Number: 159159747900478145820483398898491642637
    Not Before: 2020-06-19T00:00:42Z
    Not After: 2028-01-28T00:00:42Z
    Is CA: true
    Key Usage: Digital Signature, Certificate Sign, CRL Sign
    Status: Valid

    --- Certificate Fingerprints (Leaf) ---
    SHA-256: 6F:F8:E2:F5:D4:AE:5A:FF:92:4A:5F:AC:88:80:14:3A:30:33:7A:CF:EE:33:94:82:EF:2A:93:47:80:E4:18:EF
    SHA-1: 28:88:45:90:10:20:88:BA:87:2E:0E:7C:3A:12:D6:35:EC:26:AE:90
    =====================================

        mailsend-go -info -smtp smtp-mail.outlook.com -port 587 -printCerts

    [S] 220 MN2PR01CA0065.outlook.office365.com Microsoft ESMTP MAIL Service ready at Sat, 27 Sep 2025 00:29:10 +0000 [08DDFAA3FED0C1E0]
    [C] HELO localhost
    [C] EHLO localhost
    [S] 250-MN2PR01CA0065.outlook.office365.com Hello [x.x.x.x]
    [S] 250-SIZE 157286400
    [S] 250-PIPELINING
    [S] 250-DSN
    [S] 250-ENHANCEDSTATUSCODES
    [S] 250-STARTTLS
    [S] 250-8BITMIME
    [S] 250-BINARYMIME
    [S] 250-CHUNKING
    [S] 250-SMTPUTF8
    [C] STARTTLS
    [S] 220-2.0.0 SMTP server ready
    [C] EHLO localhost
    [S] 250-MN2PR01CA0065.outlook.office365.com Hello [x.x.x.x]
    [S] 250-SIZE 157286400
    [S] 250-PIPELINING
    [S] 250-DSN
    [S] 250-ENHANCEDSTATUSCODES
    [S] 250-AUTH LOGIN XOAUTH2
    [S] 250-8BITMIME
    [S] 250-BINARYMIME
    [S] 250-CHUNKING
    [S] 250-SMTPUTF8
    [C] QUIT
    [S] 221-2.0.0 Service closing transmission channel

    === TLS Connection Information ===
    TLS Version: TLS 1.3
    Cipher Suite: 0x1302
    Server Name: smtp-mail.outlook.com
    Negotiated Protocol:

    Certificate Chain (2 certificates):

    --- Certificate 1 ---
    Subject: CN=outlook.com,O=Microsoft Corporation,L=Redmond,ST=Washington,C=US
    Issuer: CN=DigiCert Cloud Services CA-1,O=DigiCert Inc,C=US
    Serial Number: 10535063011692331098818316272276424549
    Not Before: 2025-03-29T00:00:00Z
    Not After: 2026-03-28T23:59:59Z
    Is CA: false
    DNS Names: *.clo.footprintdns.com, *.hotmail.com, *.internal.outlook.com, *.live.com, *.nrb.footprintdns.com, *.office.com, *.office365.com, *.outlook.com, *.outlook.office365.com, attachment.outlook.live.net, attachment.outlook.office.net, attachment.outlook.officeppe.net, attachments.office.net, attachments-sdf.office.net, ccs.login.microsoftonline.com, ccs-sdf.login.microsoftonline.com, hotmail.com, mail.services.live.com, office365.com, outlook.com, outlook.office.com, substrate.office.com, substrate-sdf.office.com
    Key Usage: Digital Signature, Key Encipherment
    Status: Valid

    --- Certificate 2 ---
    Subject: CN=DigiCert Cloud Services CA-1,O=DigiCert Inc,C=US
    Issuer: CN=DigiCert Global Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US
    Serial Number: 20058375873168194746987232153701302504
    Not Before: 2020-09-25T00:00:00Z
    Not After: 2030-09-24T23:59:59Z
    Is CA: true
    Key Usage: Digital Signature, Certificate Sign, CRL Sign
    Status: Valid

    --- Certificate Fingerprints (Leaf) ---
    SHA-1: A6:F7:EC:FB:2B:F6:31:B3:A8:4F:EB:B0:9F:FD:BB:4E:3B:0F:42:11
    SHA-256: 4F:94:1A:8E:50:52:5E:09:24:4F:8F:FE:75:65:E1:6A:51:DD:10:47:04:74:94:6A:0F:BA:84:6A:86:E4:DE:8C
    =====================================

Use default settings for well known mail providers

Don’t worry about the settings of -smtp, -port and -ssl for well known
mail providers. This works for gmail, yahoo, outlook, gmx, zoho and aol.

      mailsend-go -info -use gmail

Send mail with a text message

Notice “auth” is a command and it takes -user and -pass arguments.
“body” is also a command and here it took -msg as an argument. The
command “body” can not repeat, if specified more than once, the last one
will be used.

        mailsend-go -sub "Test"  -smtp smtp.gmail.com -port 587 \
         auth \
          -user jsnow@gmail.com -pass "secret" \
         -from "jsnow@gmail.com" -to  "mjane@example.com" \
         body \
           -msg "hello, world!\nThis is a message"

The embedded new line \n will be converted to a real newline and the
final message will show up as two lines.

The environment variable “SMTP_USER_PASS” can be used instead of the
flag -pass.

Send mail with a HTML message

        mailsend-go -sub "Test"  \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user jsnow@gmail.com -pass "secret" \
        -from "jsnow@gmail.com"  \
        -to  "mjane@example.com" -from "jsnow@gmail.com" \
        body \
         -msg "<b>hello, world!</b>"

The environment variable “SMTP_OAUTH_TOKEN” can be used instead of the
flag -token.

Send mail with a HTML message, use XOAUTH2

        export SMTP_OAUTH_TOKEN='your_access_token'
        mailsend-go -sub "Test"  \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user jsnow@gmail.com \
         -oauth2 \
        -from "jsnow@gmail.com"  \
        -to  "mjane@example.com" -from "jsnow@gmail.com" \
        body \
         -msg "<b>hello, world!</b>"

Attach a PDF file

MIME type will be detected. Content-Disposition will be set to
“attachment”, Content-Transfer-Encoding will be “Base64”. Notice,
“attach” is a command it took -file as an arg. The command “attach” can
repeat.

        mailsend-go -sub "Test"  \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user jsnow@gmail.com -pass "secret" \
        -from "jsnow@gmail.com"  \
        -to  "mjane@example.com" -from "jsnow@gmail.com" \
        body \
         -msg "A PDF file is attached" \
        attach \
         -file "/path/file.pdf"

The name of the attachment will be file.pdf. To change the attachmetn
name, use the -name flag. e.g.

        attach -file "/path/file.pdf" -name "report.pdf"

Attach a PDF file and an image

Notice, the “attach” command is repeated here.

        mailsend-go -sub "Test"  \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user jsnow@gmail.com -pass "secret" \
        -from "jsnow@gmail.com"  \
        -to  "mjane@example.com" -from "jsnow@gmail.com" \
        body \
         -msg "A PDF file and a PNG file is attached" \
        attach \
         -file "/path/file.pdf" \
        attach \
         -file "/path/file.png"

Attach a PDF file and embed an image

Content-Disposition for the image will be set to “inline”. It’s an hint
to the mail reader to display the image on the page. Note: it is just a
hint, it is up to the mail reader to respect it or ignore it.

        mailsend-go -sub "Test"  \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user jsnow@gmail.com -pass "secret" \
        -from "jsnow@gmail.com"  \
        -to  "mjane@example.com" -from "jsnow@gmail.com" \
        body \
         -msg "A PDF file is attached, image should be displayed inline" \
        attach \
         -file "/path/file.pdf" \
        attach \
         -file "/path/file.png" \
         -inline

Set Carbon Copy and Blind Carbon copy

        mailsend-go -sub "Testing -cc and -bcc" \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user example@gmail.com -pass "secret" \
         -to jsoe@example.com \
         -f "example@gmail.com" \
         -cc "user1@example.com,user2@example.com" \
         -bcc "foo@example.com" \
         body -msg "Testing Carbon Copy and Blind Carbon copy"

Cc addresses will be visible to the recipients but Bcc address will not
be.

Send mail to a list of users

Create a file with list of users. The syntax is Name,email_address in a
line. Name can be empty but comma must be specified. Example of a list
file:

        # This is a comment.
        # The syntax is Name,email address in a line. Name can be empty but comma 
        # must be specified
        John Snow,jsnow@example.com
        Mary Jane,mjane@example.com
        ,foobar@example.com

Specify the list file with -list flag.

        mailsend-go -sub "Test sending mail to a list of users" \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user example@gmail.com -pass "secret" \
            -f "me@example.com" \
            -to "xyz@example.com" \
            body \
            -msg "This is a test of sendmail mail to a list of users" \
            attach \
                -file "cat.jpg" \
             attach \
                -file "flower.jpg" \
                -inline \
             -list "list.txt"

Add Custom Headers

Use the command “header” to add custom headers. The command “header” can
be repeated.

        mailsend-go -sub "Testing custom headers" \
        -smtp smtp.gmail.com -port 587 \
        auth \
         -user example@gmail.com -pass "secret" \
         -to jdoe@example.com \
         -f "example@gmail.com" \
         body -msg "Testing adding Custom headers"
         header \
             -name "X-MyHeader-1" -value "Value of X-MyHeader-1" \
         header \
             -name "X-MyHeader-2" -value "Value of X-MyHeader-2"

Write logs to a file

Use the flag -log path_of_log_file.txt

        mailsend-go -sub "test log" \
         -smtp smtp.example.com -port 587 \
         auth \
          -user example@gmail.com -pass "secret" \
          -to jdoe@example.com \
          -f "example@gmail.com" \
          body -msg "Testing log file" \
          -log "/tmp/mailsend-go.log"

Specify a different character set

The default character set is utf-8

        mailsend-go -sub "test character set" \
         -smtp smtp.example.com -port 587 \
         auth \
          -user example@gmail.com -pass "secret" \
          -to jdoe@example.com \
          -from "example@gmail.com" \
          -subject "Testing Big5 Charset" \
          -cs "Big5" \
          body -msg "中文測試"

------------------------------------------------------------------------

(Generated from docs/examples.md)

------------------------------------------------------------------------
`
)

// Print Examples ...
func PrintExamples() {
    fmt.Println(examples)
}