Mail: Difference between revisions
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*[https://www.sendmail.com/sm/open_source/docs/email_explained/ Email explained] | *[https://www.sendmail.com/sm/open_source/docs/email_explained/ Email explained] | ||
*[http://www.postfix.org/documentation.html Postfix documentation] | *[http://www.postfix.org/documentation.html Postfix documentation] | ||
*[https://www.xomedia.io/blog/a-deep-dive-into-email-deliverability/ A Deep Dive into Email Deliverability in 2024] | |||
=Servers= | =Servers= | ||
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==send mail from command line with sender address== | ==send mail from command line with sender address== | ||
echo text | mail -s testsubject -r fromuser@example.com touser@ | echo text | mail -s testsubject -r fromuser@example.com touser@somewhere.tst | ||
==Test submission== | ==Test submission== | ||
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==451 4.7.500 Server busy. Please try again later== | ==451 4.7.500 Server busy. Please try again later== | ||
Try rate limiting your outgoing mail. Most likely you need to check/add SPF/DKIM/DMARC | Try rate limiting your outgoing mail. Most likely you need to check/add SPF/DKIM/DMARC | ||
==The mail server [x.x.x.x] has been temporarily rate limited due to IP reputation== | |||
Latest revision as of 13:28, 2 April 2025
Docs
Servers
Tools
- http://mxtoolbox.com/
- Swaks - Swiss Army Knife for SMTP
- mail-tester.com
Blacklists
Mailing lists
Related services and tools
- IMAP
- Fetchmail
- Procmail
- formail
- bayes spamfiltering
- SRS
- swak
- sendEmail: commandline tool for sending test mails
Filters
Webmail
SMTP servers of ISPs
Tips&Tricks
Send maildir mails to a remote server
without damaging the From and Subject etc.
cat somemail | formail -i "To: new@address.com" | sendmail -t
script for testing mailservers
sendEmail
send mail from command line with sender address
echo text | mail -s testsubject -r fromuser@example.com touser@somewhere.tst
Test submission
See https://halon.io/blog/how-to-test-smtp-servers-using-the-command-line/ Encode using
echo -n whatever | base64
openssl s_client -starttls smtp -crlf -connect server:587 ehlo your.host auth login base64 encoded username base64 encoded password
FAQ
451 4.7.500 Server busy. Please try again later
Try rate limiting your outgoing mail. Most likely you need to check/add SPF/DKIM/DMARC
