We are using Sophos Gateway and routing email out of Microsoft 365 through a Sophos Smarthost. When a user sends an email that fails to be delivered due to the recipient address being misspelled or the recipient not existing the senders never receive…

Hello, We have a client that sends large attachments, and Sophos is failing to send it. Is there a way to get around this? M365 allows you to be able to send 150 MB now. I know I dont recommend this to clients . But that is what we have in this…

Hello everyone, One of our client is used Sophos pure message for very long time and recently moves to Sophos central email advance. client using on-prem Microsoft exchange server 2010 and Sophos central email works perfectly until client face an issue…

Hello, we have a problem that some Mails could not delivered to some recipients dut to a large Header. Error received 552 5.6.0 Headers too large (32768 max) The Mails are sent via Office 365 over Transport Rules. I would like to reduce…

Hi There, It seems that some of my emails are not reaching some of my clients. Below are details I received recently for a client. Reporting-MTA: dns; googlemail.com Received-From-MTA: dns; xxxx@sgsmails.com Arrival-Date: Thu, 04 Apr 2024 16:58:35…

I've searched the forums but haven't found exactly this use-case. I'm trying to send an email to a domain, but it's being rejected by its MTA with the message 554 5.7.1 Service unavailable; Client host [x.x.x.x] is blacklisted When I visit the lookup…

Hi Most of our customers complain about problem sending emails to gmail mailboxes, last few days. Any idea why? Did someone has the same problem? Thanx

Hi, I've a problem with your antispam system. When I try to send a mail to the domain "bolognafiere.it" it says that my ip is blacklisted, so I check on your site: https://www.sophos.com/en-us/threat-center/ip-lookup.aspx and it says my IP is ok. …

We host web and email services on a VPS for our clients in the UK. We have recently discovered an issue with sending emails from our server to anyone whose email is on hydra.sophos.com. Such emails are blocked with a “ connection refused ” message…

Hello Sophos friends, at the moment we're receiving lots of bounce messages because the SOPHOS Mail Gateway server id-euc1.prod.hydra.sophos.com is blacklisted at UCE. Here's the bounce message: What's the right way to contact SOPHOS to un…

Hi All, We have to add this relay relay-us-west-2.prod.hydra.sophos.com for our oublound exchange email . However we can't reached this endpoint , is there any thing need to be permise ? BR Tovo

For some time now, some emails that I have been sending from Outlook are bouncing. At the moment an email arrives informing me of the following error: 554 5.7.1 Service unavailable; Sender address [xxx.yyy@xyz.com] blocked using uri.cal1.sophosxl.com…

Hi, I am currently in trial mode and doing some email sending with a test domain. It is a hosted on MS 365 I believe I have everything setup correctly but I am receiving this error when sending from an outside address Any ideas on what may be wrong…

Hi, we have a problem with forwarding emails. Exchange 2013 on Prem. Using Email Security on Sophos Central. This seems to have come up on here before, but I cant find a solution. Any help appreciated. Thanks Trev I use exchange to forward…

Hi, trying to forward emails external using Exchange 2013 on Prem. Sophos Central Email setup. All emails come in and go out as normal, just Forwarding fails External emails sent to me from internal and external users are not being forwarded on…

I cannot send a Cisco support file (an EXE inside a ZIP) without receiving the following message: I have turned off all advanced features in the email policy, and there appears to be no outbound policy specific options. How do I allow myself to send an…

For some weeks now, some – but not all – emails I have been sending from Apple Mail are getting bounced. In my bin, I can see a Google red traffic light icon. And also the following: 554 5.7.1 Service unavailable; Sender address [xxxxx] blocked…

Hi list, from today when sending emails to one of our supplier we receive: Arrival-Date: Mon, 1 Nov 2021 11:19:08 +0100 (CET) Final-Recipient: rfc822; user @userdomain.com Original-Recipient: rfc822;user@userdomain.com Action: failed Status: 5…

We received the usual standard spam e-mail through Sophos Email Gateway stating that after visiting a website the local machine was infected and all user activity logged and the camera used to record the user. The only way to prevent releasing compromising…

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…

I've searched the forums but haven't found exactly this use-case. I'm trying to send an email to a domain, but it's being rejected by its MTA with the message 554 5.7.1 Service unavailable; Client host [..] is blacklisted When I visit the lookup page…

Hello All, I am receiving reports from one of our clients that emails they are sending out are not being received by their clients. I have looked at Sophos and the logs are showing delivered. I checked their mx record in DNS checker and it looks like…

Hi there, Does anybody know any suggestions, recommendations or workarounds from sophos about this annoying bug? It's known for month and nothing happens. Thanks. Chris

Hi I have an issue where Sophos server is blocking 1 particular email from our domain. Only from sending outbound email. The email has been added into the allowed list and the blocked emails are not in the Quarantined email. Its outbound email is…

Hello, can be Sophos Central Email blacklisted? I was trying to send emails to my clients and i had the following error: Message not delivered Your message could not be delivered to one or more recipients. The details are attached below. For further…