Question Plesk SMTP authentication Error through Python script

[happycoding.ai]

Server operating system version

Centos 7

Plesk version and microupdate number

18.0.43

I have one VPS with a Plesk server configuration. On the same VPS Plesk-Mail server is running. I am able to send mail through webmail.

But whenever using a script and using the below values to send mail through SMTP, it gives an authentication error.

MAIL_SERVER ='smtp.<domain>'
MAIL_PORT = 587/465
USER=
PASS=
MAIL_USE_TLS = False
MAIL_USE_SSL = True

How to solve this problem?

Note: Same above config working with sSMTP tool

 

[Nik G]

hello @happycoding.ai ,
please check to which IP resolves smtp.<domain> when you doing ping or telnet from the same server where SMTP daemon is running.
probably you need to use an IP address or even an localhost as MAIL_SERVER

 

[happycoding.ai]

hello @happycoding.ai ,
please check to which IP resolves smtp.<domain> when you doing ping or telnet from the same server where SMTP daemon is running.
probably you need to use an IP address or even an localhost as MAIL_SERVER

Thanks @Nik G

ping -a smtp.<domain>
Pinging us2.smtp.mailhostbox.com [208.91.198.38] with 32 bytes of data:
Reply from 208.91.198.38: bytes=32 time=341ms TTL=43
Reply from 208.91.198.38: bytes=32 time=307ms TTL=43
Reply from 208.91.198.38: bytes=32 time=371ms TTL=43
Reply from 208.91.198.38: bytes=32 time=310ms TTL=43
(Not sure why it is pointing to this)

Now the next question is if I point to localhost or VPS IP, what would be the SMTP port?

 

[Nik G]

it depends from your settings, but usually it is 465.

you can check what port listen with command like

ss -nptl|grep -i master

also command

grep '<domain>' /etc/postfix/*

should help to understand at what IP address MTA listen for this domain.