Issue Undelivered mail - SMTP port 25

[andre_c]

Server operating system version

Ubuntu 22.04.2 LTS

Plesk version and microupdate number

18.0.51

Hello,

although smtp port 25 is enabled in the panel, plesk is unable to send emails from the various password reset systems or automated emails with the various cms installed

VPS IONOS Provider

 

[Peter Debik]

Have you checked /var/log/mail for entries associated with mail attempts? Normally you can find hints there why a mail cannot be sent.

 

[andre_c]

Have you checked /var/log/mail for entries associated with mail attempts? Normally you can find hints there why a mail cannot be sent.

Unfortunately not, how can I reach the directory? via ftp to the associated domain?

 

[Peter Debik]

This can be accessed from either Tools & Settings > Assistance & Troubleshooting > Log Browser or through SSH (Linux console).

 

[MarkM]

Ionos is one such provider that has port 25 blocked by default. You need to contact their support to unblock it.

 

[andre_c]

This can be accessed from either Tools & Settings > Assistance & Troubleshooting > Log Browser or through SSH (Linux console).

Nemesis ESMTP Service not available 554-No SMTP service 554-Bad DNS PTR resource record. 554 For explanation visit SMTP Error Messages of the IONOS Mail Servers - IONOS Help

554 Bad DNS PTR resource record​

Problem:

Email from your email server has been rejected because the PTR resource record (PTR-RR) of your IP address does not comply with IONOS policy.

Solution:

Switch from a dynamically assigned IP address to a fixed IP address.

Verify that the PTR-RR is the default generic entry of your provider. Assign your email server its own full domain name (FQDN).

 

[Peter Debik]

Is that a question or a statement what you are now up to do?

 

[andre_c]

I have attached feedback from the plesk logs and what is mentioned in the ionos guide but I am not clear on the procedure to follow in order to solve the problem

Is that a question or a statement what you are now up to do?