I try to send mail with Mutt through my own mail server. My mail server run Postfix and Dovecot. I configured it by following this tutorial. I can send / receive email on my server with Gnome Evolution and many other programs. I would like to use Mutt with this configuration :set realname = {name}set header_cache = ~/.mutt/cache/headersset certificate_file = ~/.mutt/certificatesset message_cachedir = ~/.mutt/cache/bodiesset spoolfile = imaps://{server address}:993/INBOXset imap_user = {address}set imap_pass = {password}set imap_passive = noset smtp_url = smtp://{server}:587set smtp_pass = {password}set from = {address}set use_envelope_from = yesset ssl_starttls = yesset ssl_force_tls = yesI use Mutt on my laptop, as a client of my server, so Mutt is not launched from my server.The problem is, every time I try to send a mail, I have got this error : SMTP session fail : Relay access deniedThe corresponding logs in /var/log/mail.log are :Jan  7 17:49:58 ns333449 postfix/submission/smtpd[15264]: connect from unknown[{my ip]Jan  7 17:49:59 ns333449 postfix/submission/smtpd[15264]: NOQUEUE: reject: RCPT from unknown[{my ip}]: 554 5.7.1 <test@yopmail.com>: Relay access denied; from=<{my address}> to=<{destination address}> proto=ESMTP helo=<{my computer}>Jan  7 17:49:59 ns333449 postfix/submission/smtpd[15264]: lost connection after RCPT from unknown[{my ip}]Jan  7 17:49:59 ns333449 postfix/submission/smtpd[15264]: disconnect from unknown[{my ip}]I can't understand why. In Gnome Evolution, my mail server parameters are :IMAP :Server : {my server address}Port : 993User : {my mail address}SSL on dedicated portAuthentication with passwordSMTP :Server : {my server address}Port : 587Server require an authenticationSTARTTLS after connectionPlain authenticationUser : {my mail address}I hope I gave you enough information.EDIT : As suggested by tarleb, I wrote smtpd_tls_loglevel = 1 in /etc/postfix/main.cf, this is what I get when I try to send a mail:Jan  8 11:54:16 ns333449 postfix/submission/smtpd[13158]: connect from unknown[{my ip}]Jan  8 11:54:17 ns333449 postfix/submission/smtpd[13158]: Anonymous TLS connection established from unknown[{my ip}]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)Jan  8 11:54:20 ns333449 postfix/submission/smtpd[13158]: warning: unknown[{my ip}]: SASL PLAIN authentication failed:Jan  8 11:54:21 ns333449 postfix/submission/smtpd[13158]: lost connection after AUTH from unknown[{my ip}]Jan  8 11:54:21 ns333449 postfix/submission/smtpd[13158]: disconnect from unknown[{my ip}]
Mutt and Postfix : relay access denied
email;postfix;mutt