Collection of Go projects that deal with email, SMTP, IMAP, and other related tasks

mail_mime_smtp.md

Go Email Projects

Full SMTP Client + SMTP Server:

• https://github.com/toorop/tmail
• https://github.com/xuqingfeng/mailman

SMTP Server

• go-guerrilla SMTP server - https://github.com/flashmob/go-guerrilla
• oakmail - https://github.com/oakmail/backend
• smtpd + mongodb - https://github.com/gleez/smtpd
• SMTP like HTTP - https://github.com/mhale/smtpd
• Robust delivery (Cassandra, Rabbitmq, redis backed) - https://github.com/DronRathore/safedelivr
• https://github.com/lavab/mailer

SMTP Server (Other

• SMTP honeypot - https://github.com/sec51/honeymail
• Inbucket email testing application - https://github.com/jhillyerd/inbucket
• Gateway between SMTP/POP3 and TOX protocol. - https://github.com/KeinPfusch/venom-Mail
• Gateway between SMTP and slack - https://github.com/egeland/mailtoslack
• Gateway between SMTP and twitter - https://github.com/nathan-osman/epigeon
• Gateway between SMTP and Mattermost - https://github.com/rodcorsi/mattermail
• Simple SMTP server with web view - https://github.com/mgerb/tmail
• bigmail stress-testing server - https://github.com/dndx/bigmail

SMTP Server (Basic/Demos

• write all incoming emails to file - https://github.com/andrewarrow/jungle_smtp/blob/master/main.go
• read body into mail.Message and send over channel - https://github.com/slyngshede/gosmtpd/blob/master/smtpd.go
• smtpd server with callback struct - https://github.com/mailproto/smtpd
• simple server for SMTP Relays and Forwarders - https://github.com/svarlamov/gosmtp/

SMTP Client:

• Hectane SMTP Client - https://github.com/hectane/hectane
• simple SMTP client - https://github.com/nilslice/email
• HTTP POST to SMTP gateway - https://github.com/SchumacherFM/mailout
• MIME/SMTP client with support for attachments - https://github.com/domodwyer/mailyak

SMTP Client (Other)

• fauxmailer random email generator - https://github.com/jhillyerd/fauxmailer
• Paperboy Email Campaigns Sender - https://github.com/rykov/paperboy
• campaign mailer with tracking - https://github.com/toomore/mailbox
• bart - templated emails - https://github.com/mp4096/bart
• clerk - markdown email sender - https://github.com/mp4096/clerk

Email Address Verification

• trumail - https://github.com/sdwolfe32/trumail
• checkmail - https://github.com/badoux/checkmail
• Temporary email detection library - https://github.com/gernest/mailchecker-go
• Disposable email detection library - https://github.com/ferhatelmas/disposable
• All known public email providers - https://github.com/goware/emailproviders

MIME / Mail Parsing

• enmime MIME encoding and decoding + test data - https://github.com/jhillyerd/enmime
• older, partial MIME decoding lib - https://github.com/veqryn/go-email
• github.com/tgulacsi/go/i18nmail - https://github.com/tgulacsi/go/blob/master/i18nmail/walk.go

IMAP

• Pluto distributed IMAP server - https://github.com/go-pluto/pluto

SPF

• https://github.com/asggo/spf

Email (Other)

• find the reason why your emails bounced - https://github.com/erizocosmico/go-bouncespy
• trim replies from plain text email - https://github.com/imdario/goert
• bloodlines - https://github.com/ghmeier/bloodlines

Handling Client Command Chain

• tmail - https://github.com/toorop/tmail/blob/master/core/smtpd_session.go#L1213

requirements.md

Things to remember building a MTA, client, MIME-parser, or SMTP server

Security

• Check that HELO name, the "from" address and others are FQDN (Valid MX or A DNS records)
• Check order of mail commands.
• Max length of everything (addresses, body, commands, etc..)

https://github.com/Xeoncross/gmail has some tests about this.