SMTP error from remote mail server after end of data: 554 mail server permanently rejected message (#5.3.0)

Operating System & Version
CentOS
cPanel & WHM Version
108.0.14

Bin Emmanuel

Member
Mar 17, 2023
8
3
3
Abuja, Nigeria
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Reseller Owner
This morning I got a message from the office saying they weren't able to send an email to a particular recipient the email contains an attachment a .pptx file which is ~15MB in size.
I did a lot of digging to figure out what the problem might be and from what I learnt the issue might be a result of bad DNS from my end or the recipient server blocking ours. Now looking at my DNS records it seems everything is fine and I've not been able to convince anyone at the office that the problem isn't from us and I'll really appreciate a hint to solving the problem permanently.MAIL DELIVERY FAILED.png
 
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cPRex

Jurassic Moderator
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Oct 19, 2014
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Hey there! It's clear from the bounce message that the problem is likely not on your end since it says "mail server permanently rejected message." Now, this could be because they determined your message was spam, or your IP address is on some type of block list on the recipient end, but with the information we have there is nothing you can do on your server to resolve this issue. Since the message does reach the recipient mail server, that rules out a DNS issue.

The only thing you can do is contact that remote mailserver using another email address to see if you can get more details on why they are rejecting your messages.
 
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cPRex

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Bin Emmanuel

Member
Mar 17, 2023
8
3
3
Abuja, Nigeria
cPanel Access Level
Reseller Owner
Now I'm wondering if changing my IP Address might solve the problem since I would be getting one that isn't blacklisted. The thing is I don't know why the IP Address was listed at UCEPROTECT and even though I understand it to be ransomware I still need to get my IP Address off its list because some recipients still use it and these recipients are really important to the company. If I knew why they blacklisted our IP Address I'd rather fix the problem and be whitelisted instead of switching to a new Server with a different IP Address.
 

cPRex

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The best thing to do would be to contact your hosting provider or datacenter. However, if you're only seeing problems with email to this one particular location, it would be best to reach out to them through an alternative email address to see if they can provide you more specific details on why you are blocked.
 
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