Failed to send mail: SMTP command failed

Virtualmin
1

Hello everyone i installed virtualmin but when i try to send an email using usermin i always have an error that tells me Failed to send mail: SMTP command failed: I need help it’s been a week since I’m looking for a solution that can not be found.

2

Hello my dear friend, bit more info is probably needed but firstly could you see what port your using for smtp, if 25 try changing it to 587 and try again.

Really hope this solves your problem.

Kind regards.

Welshman.

3

https://www.virtualmin.com/node/65252#comment-810416

Is that post related btw?

Kind regards,

Welshman.

4

Hello Welshman,
I am a novice in the administration of a server. could you tell me where I need to change the port.
thank you

5

Bit confused, your other post says fixed?

What email client are you using, have you tried other than using Usermin.

Kind regards,

Welshman.

6

Hello Welshman.
no it’s not closed yet.
I used roundcube too but I have the following error: SMTP error (250): failure during authentication.
when i do postconf -n here’s what i have in the console:

postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_sender_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_client_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_helo_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_sender_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_client_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_helo_restrictions
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
home_mailbox = Maildir/
inet_interfaces = all
inet_protocols = all
mailbox_command = procmail -a “$EXTENSION”
mailbox_size_limit = 0
milter_default_action = accept
milter_protocol = 2
mydestination = $myhostname, radiotokpa.info
myhostname = gracewallaceofficiel.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = /etc/mailname
non_smtpd_milters = inet:localhost:8891
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_security_level = dane
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_milters = inet:localhost:8891
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_tls_CAfile = /etc/postfix/postfix.ca.pem
smtpd_tls_cert_file = /etc/postfix/postfix.cert.pem
smtpd_tls_key_file = /etc/postfix/postfix.key.pem
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
virtual_alias_maps = hash:/etc/postfix/virtual

7

Hi, have you tried setting up the account in a client like Outlook, Thunderbird etc and if it works?

If it does you might want to look here https://www.virtualmin.com/node/65253

What did you do anyway at the time when it stopped working?

Also in the Postfix config area / SMTP Authentication And Encryption mine looks like this …

https://i.postimg.cc/HWFX0xwG/pf-smtp.png

Regards.