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Cannot receive backup email: 504 5.5.2 <Sophos>: Helo command rejected: need fully-qualified hostname

Hello. I am using built-in mail server on Sophos XG18 to send weekly backup emails to myself. While testing backup email, I received following errors and was not able to get backups on my email:

SMTP error from remote mail server after RCPT TO:<[REDACTED]>:
504 5.5.2 <Sophos>: Helo command rejected: need fully-qualified hostname

Is there a way to change the name from Sophos to something that looks like FQDN (e.g. Sophos.fw)?

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0 PhilippRusch over 4 years ago

Hi Ocha,

have a look here: https://community.sophos.com/products/xg-firewall/f/initial-setup/100311/how-to-assign-domain-hostname-to-sophosxg

Google is your friend :-)

Mit freundlichem Gruß, best regards from Germany,

Philipp Rusch

New Vision GmbH, Germany
Sophos Silver-Partner

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0 Ocha over 4 years ago in reply to PhilippRusch

I tried it but it did not work. To start with my hostname was not Sophos but in `HELO` command you can see it passes `Sophos` as argument which is supposed to be FQDN. Now, I followed that link above. I created real DNS entry (I have couple domains) for my FW and added it in FQDN list and also as hostname in Admin Settings. I rebooted FW and it still uses Sophos as fqdn in HELO command.
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+1 PhilippRusch over 4 years ago in reply to Ocha

Then try this, please: https://community.sophos.com/products/xg-firewall/f/email-protection/77473/how-to-change-helo-hostname-for-outbound-smtp-sessions

Mit freundlichem Gruß, best regards from Germany,

Philipp Rusch

New Vision GmbH, Germany
Sophos Silver-Partner

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0 Ocha over 4 years ago in reply to PhilippRusch

That was it! Thank you so much
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0 Ocha over 4 years ago in reply to PhilippRusch

That was it! Thank you so much
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