Mail

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Docs

Servers

Tools

Blacklists

Mailing lists

Related services and tools

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@example.com

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