# SMTP sending mail error **URL:** \ **Category:** Help\ **Created:** [April 19, 2022, 6:02am UTC](https://vaultwarden.discourse.group/t/smtp-sending-mail-error/1580 "2022-04-19T06:02:34Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![next\_generation](https://avatars.discourse-cdn.com/v4/letter/n/439d5e/32.png) [@next\_generation](https://vaultwarden.discourse.group/u/next_generation)\ **Post date:** [April 19, 2022, 6:02am UTC](https://vaultwarden.discourse.group/t/smtp-sending-mail-error/1580/1 "2022-04-19T06:02:34Z")
I have set up a postfix for sending mails but i am facing an error “Error sending SMTP test email SMTP Client error: internal client error: No compatible authentication mechanism was found” and in mail logs : - Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: connect from unknown[172.17.0.2] Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: discarding EHLO keywords: CHUNKING Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: lost connection after EHLO from unknown[172.17.0.2] Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: disconnect from unknown[172.17.0.2] ehlo=1 commands=1 Postfix configuration: # postconf -n alias\_database = hash:/etc/aliases alias\_maps = hash:/etc/aliases command\_directory = /usr/sbin compatibility\_level = 2 daemon\_directory = /usr/libexec/postfix data\_directory = /var/lib/postfix debug\_peer\_level = 2 debugger\_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon\_directory/$process\_name $process\_id & sleep 5 html\_directory = no inet\_interfaces = all inet\_protocols = all mail\_owner = postfix mailq\_path = /usr/bin/mailq.postfix manpage\_directory = /usr/share/man meta\_directory = /etc/postfix mydestination = localhost.localdomain, localdomain, localhost, localhost.localdomain, localhost myhostname = [bitwarden.mydomain.com](http://bitwarden.mydomain.com) mynetworks = 127.0.0.0/8, localhost, 172.17.0.0/16, 172.17.0.2 newaliases\_path = /usr/bin/newaliases.postfix queue\_directory = /var/spool/postfix readme\_directory = /usr/share/doc/postfix/README\_FILES relayhost = sample\_directory = /usr/share/doc/postfix/samples sendmail\_path = /usr/sbin/sendmail.postfix setgid\_group = postdrop shlib\_directory = /usr/lib64/postfix smtp\_tls\_CApath = /etc/pki/tls/certs smtp\_tls\_security\_level = none smtpd\_tls\_cert\_file = /etc/pki/tls/certs/postfix.pem smtpd\_tls\_key\_file = /etc/pki/tls/private/postfix.key smtpd\_tls\_security\_level = none unknown\_local\_recipient\_reject\_code = 550 ![SMTPVaultwarden](https://global.discourse-cdn.com/free1/uploads/vaultwarden/original/1X/d9e675d6b3b5a27f6b3b2c3d21e3765309dc77ba.png) I could not understand what could be the problem ? ---
**Author:** ![reinob](https://avatars.discourse-cdn.com/v4/letter/r/96bed5/32.png) [@reinob](https://vaultwarden.discourse.group/u/reinob)\ **Post date:** [April 19, 2022, 2:52pm UTC](https://vaultwarden.discourse.group/t/smtp-sending-mail-error/1580/2 "2022-04-19T14:52:46Z")
You probably want to use port 587 (submission) instead of 25. (and perhaps you may want to reconsider whether you really want to run your own SMTP server…) ---
**Author:** ![kevdog](https://yyz2.discourse-cdn.com/free1/user_avatar/vaultwarden.discourse.group/kevdog/32/168_2.png) [@kevdog](https://vaultwarden.discourse.group/u/kevdog)\ **Post date:** [April 24, 2022, 3:28am UTC](https://vaultwarden.discourse.group/t/smtp-sending-mail-error/1580/3 "2022-04-24T03:28:31Z")
Are you trying to smtp forward through gmail’s smtp server’s or another service? ---
**Author:** ![cksapp](https://avatars.discourse-cdn.com/v4/letter/c/b9e5f3/32.png) [@cksapp](https://vaultwarden.discourse.group/u/cksapp)\ **Post date:** [April 24, 2022, 3:45am UTC](https://vaultwarden.discourse.group/t/smtp-sending-mail-error/1580/4 "2022-04-24T03:45:19Z")
With Postfix, given the 127.0.0.0/8 CIDR and no relayhost set I would presume that the OP here is attempting to set up send from SMTP directly. Assuming MX records are set correctly, but past that I dare not touch running a mail server. As @reinob puts it its really not worth the hassle imo.