Plesk customer email issue

AlpineHost · Sep 12, 2024

Hi all,

I have a customer in the US that is receiving a "host relay3.domain.com[IP Address] refused to talk to me: 554 relay3.domain.com" error on emails sent to his US Government email address and a few other domains, from our Plesk server. We have done an IP check on our side and we are all good, no blacklisting anywhere. SPF, DMARC and DKIM records are all confirmed to be correct. What will be the next step to check? Or, is this something that the customer needs to figure out on his own?

Thank you guys in advance for the feedback.

NizhalHosting · Sep 16, 2024

yes, ask the client to check his/her ip weather it is blacklisted , these things nowadays happens a lot, as all servers are protected by WAF firewall and securing their servers

AlbaHost · Sep 16, 2024

AlpineHost said:
Hi all,

I have a customer in the US that is receiving a "host relay3.domain.com[IP Address] refused to talk to me: 554 relay3.domain.com" error on emails sent to his US Government email address and a few other domains, from our Plesk server. We have done an IP check on our side and we are all good, no blacklisting anywhere. SPF, DMARC and DKIM records are all confirmed to be correct. What will be the next step to check? Or, is this something that the customer needs to figure out on his own?

Thank you guys in advance for the feedback.

Until you provide the complete failure email logs, we can just spekulate. Hide the details in the failed returning logs and provide it.

largoes · Feb 24, 2025

Since your SPF, DKIM, and DMARC records are good and there’s no blacklisting, the next step would be to check the email headers from the bounce-back message for more details. Sometimes, the receiving server provides clues about why emails are being rejected.

DediRock · Mar 7, 2025

It sounds like the recipient’s mail server is rejecting the emails. Check if your IP is on any private blocklists, ensure your reverse DNS (PTR) is set correctly, and try contacting the recipient’s IT team for more details.

Harry P · Mar 17, 2025

AlpineHost said:
I have a customer in the US that is receiving a "host relay3.domain.com[IP Address] refused to talk to me: 554 relay3.domain.com" error on emails sent to his US Government email address and a few other domains, from our Plesk server. We have done an IP check on our side and we are all good, no blacklisting anywhere. SPF, DMARC and DKIM records are all confirmed to be correct. What will be the next step to check? Or, is this something that the customer needs to figure out on his own?

Your setup seems fine, usually, this error is about missing or incorrect reverse DNS (PTR) records or strict filtering on the recipient’s server. Double-check your PTR record matches your mail server domain exactly. If that’s okay, the next best step is contacting the recipient's IT team directly to ask them to whitelist your IP or domain.

DemoTiger · 2025-03-25T02:18:26+0000

I think the error email doesn't contain much information and is failing on some recipients using a particular type of firewall/security system, not all the recipients.

Plesk customer email issue

AlpineHost

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NizhalHosting

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AlbaHost

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largoes

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DediRock

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Harry P

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