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Email Gateway fails delivering emails to external recipients in a distro list

We are experiencing an issue with the cloud gateway.

The product has been in service for about 36days and it seems for those 36 days no external partner has been able to receive emails from our distro list.

If we send an email to the distro they get it, however the emails from external partners and are failing on attempts to deliver to any external partner.

If I disconnect my O365 outbound connector, will the emails then pass thru O365 instead?
I've tried creating a new connector rule that has a few domains listed that are known to fail and set the transport to check for MX vs the relay.

That seems to not work either.

Anyone else facing similar issues that can shed some advice?

Added tags
[edited by: Raphael Alganes at 3:54 AM (GMT -7) on 7 Jun 2023]

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0 emmosophos over 3 years ago

Hello there,

Thank you for contacting the Sophos Community.

Central Email will not deliver emails in DL if the DL contains external contacts not part of the protected domain, for example if your Central Domain is mydomain.com and your DL contains email for user1@mydomain.com user2@mydomain.com person1@fakeaccount.com central won't route the email for the later.

The send connector for the specific domain should work.

If you need assistance with this configuration, please reach out to your Sales Engineer, so they can assist you with it.

Regards,

Emmanuel (EmmoSophos)

Technical Team Lead, Global Community Support
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0 emmosophos over 3 years ago

Hello there,

Thank you for contacting the Sophos Community.

Central Email will not deliver emails in DL if the DL contains external contacts not part of the protected domain, for example if your Central Domain is mydomain.com and your DL contains email for user1@mydomain.com user2@mydomain.com person1@fakeaccount.com central won't route the email for the later.

The send connector for the specific domain should work.

If you need assistance with this configuration, please reach out to your Sales Engineer, so they can assist you with it.

Regards,

Emmanuel (EmmoSophos)

Technical Team Lead, Global Community Support
Sophos Support Videos | Product Documentation | @SophosSupport | Sign up for SMS Alerts
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0 IT Rene over 3 years ago in reply to emmosophos

I have disabled the O365 outbound connector.

However, as of this AM. The emails are still failing thru distro.

My next thoughts are to undo the MX portion. However, will that break my inbound traffic?
Just need to get my distro working again.

Hate to do it, but looks like I will have to disable the sophos gateway till they can't get this resolved.
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0 emmosophos over 3 years ago in reply to IT Rene

Hello there,

You can update the MX record of your O365 so the inbound email doesn't go through Central, which will leave you without protection.

I would highly recommend you to reach out to your Sales Engineer, so they can assist you with a workaround and to double-check your send connectors for the emails in the DL that are not part of the domain protected by central.

Regards,

Emmanuel (EmmoSophos)

Technical Team Lead, Global Community Support
Sophos Support Videos | Product Documentation | @SophosSupport | Sign up for SMS Alerts
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