Issue Roundcube webmail bad Helo and rDNS

[suin]

Hi, I've a dedicated server with Debian 9, Plesk Obsidian 18.0.27 and hostname pleskserver.domain.com and IP XX.XX.XX.XXX. I've installed 8 IP's to split customers: YY.YY.YY.YYY, ZZ.ZZ.ZZ.ZZZ, etc.

One customer is hosted in YY.YY.YY.YYY, when I send an email using Outlook or Thunderbird, Helo is correct because use mail.clientdomain.com (A record to YY.YY.YY.YYY) and rDNS is ok.

But when I send an email using Roundcube webmail, Helo shows pleskserver.domain.com instead webmail.clientdomain.com, so rDNS is not correct because IP's are different.

Why webmail use server hostname instead webmail.clientdomain.com?

Thanks, best regards.

 

[vimobe]

Hi, Is the 8 IP you mention is public ip?

You may want to go to mail server settings and check outgoing mail mode as: Send from domain IP addresses and use domain names in SMTP greeting.
make sure DKIM and SPF record set properly and SPF to include and allow each specific ip address

 

[suin]

Hi, yes, all IP's are public.

Thank you for your answer, I've readed that this option may list your server in CBL spam list, I don't know if this is true nowadays or I can use this option safely.