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Mail cannot send to sophos customers, Client host [xx.xx.xx.xx] is blacklisted...

We have an SMTP postfix server for our customers, they send mail to sophos customers and these are blocked:

<xxxxxx@xxxxxxxxit>: host
mx-01-eu-west-1.prod.hydra.sophos.com[52.30.72.188] said: 554 5.7.1 Service
unavailable; Client host [91.121.253.253] is blacklisted. Visit
www.sophos.com/.../ip-lookup.aspx
to request delisting (in reply to RCPT TO command)

The problem is that sophos ip check respond OK and the support chat says me to call the recipient and ask to open a ticket...

There are other more professional solutions?

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emmosophos over 3 years ago +2 suggested

Hello Marco, Thank you for contacting the Sophos Community. If you already confirm that the domain and IP being used isn’t blacklisted in any blacklist, send me a PM and I can open a ticket in your…

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0 Kyle Parrish over 3 years ago

Is this happening to multiple recipients that utilize SOPHOS MTA?
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0 Marco Ceccarelli over 3 years ago in reply to Kyle Parrish

yes, multiple recipient
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0 Marco Ceccarelli over 3 years ago in reply to Marco Ceccarelli

postfix log
https://pastebin.com/cyMBkUvh
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0 Kyle Parrish over 3 years ago in reply to Marco Ceccarelli

Interesting, Sophos Labs clearly shows it is not blocked (on their threat list).

Hopefully someone from Support can chime in. The link to dispute an IP seems to go in loops...
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0 Marco Ceccarelli over 3 years ago in reply to Kyle Parrish

the problem is that seem that sophos does not offer the minimal contact if you are not a sophos customer..
via online chat says me to ask the recipient to open a case but the recipient is not clearly a sysadmin
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0 Marco Ceccarelli over 3 years ago in reply to Kyle Parrish

the problem is that seem that sophos does not offer the minimal contact if you are not a sophos customer..
via online chat says me to ask the recipient to open a case but the recipient is not clearly a sysadmin
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0 Kyle Parrish over 3 years ago in reply to Marco Ceccarelli

In this case, I would think the owner/admin of the IP address should have a way to request removal from the blacklist. I know this was an option but I can't find the URL. FloSupport can you offer any assistance on where this can be done?
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