Mail

wikipedia:Mail

• SPF: Sender Policy Framework (SPF) (2014)
• DMARC: Domain-based Message Authentication, Reporting and Conformance (DMARC) (March 2015)
• DKIM: DomainKeys Identified Mail (DKIM) (2011)

echo "This is the body" | mail -s "This is the subject" [email protected]
/var/mail/USERNAME

mail .../...
send-mail: fatal: open /etc/postfix/main.cf: No such file or directory
Can't send mail: sendmail process failed with error code 75

Ports

• 25 SMTP
• 110 POP3
• 143 IMAP
• 587 submission
• 993 IMAP over SSL (IMAPS)
• 995 POP3 over SSL

Services

• Gmail
• iCloud
• Zoho mail
• Yahoo Mail

Related

• mailutils, including mail replacement
• Python: import email
• Email spoofing
• mailx

See also

• Mail, SPF, DMARC, MX, DKIM, ARC, Email Authentication, Email spoofing, Sender ID
• Mail, SMTP, submission, SMTPS, POP, IMAP, StartTLS, Exim, Postfix, IRedMail, Fail2ban, Dovecot, Roundcube, DKIM, SPF, DMARC, MX, ssmtp, mailx
• Mail, email: Postfix, mail, SMTP, LMTP, POP3, IMAP, mailutils, amavis, Gmail, iCloud, ssmtp, msmtp