550 Error: no such user trying to send an email

[Federico Liva]

For days I have been unable to send emails to the jocorporation.fit domain, although the destination email address exists. Trying to send the email from Gmail or something else it all works, the problem that occurs on Poste is this:

2020-11-18T07:35:30.571Z [D7C77018-9B27-47B7-94B4-5F90D4350600.1] 127.0.0.1:57284%Unknown ([e-mail]) [e-mail] -> - [][] 550 Error: no such user [e-mail]

What's going on?

[SH]

Are you sure you are sending to the right address?

elisabetta.boccuni@jocorporation. f it

‌

[Federico Liva]

Absolutely yes. The domain is .FIT, you can verify it by going to https://www.jocorporation.fit/

By sending from Gmail or other email providers, no problem.

[SH]

Please paste here log/delivery/del/D/7/D7C77018-9B27-47B7-94B4-5F90D4350600.1.results

[Federico Liva]

There is no trace of that file in the folder. But I found it in the log/delivery/tx/D/7 path.

Here is the content:

{
"mail_from": {
"pass": [],
"fail": [],
"msg": [],
"err": [],
"skip": [],
"action": "accept",
"code": "CONT",
"address": "[e-mail]",
"human": "action: accept, code: CONT, address: [e-mail]",
"human_html": "action: accept, \t code: CONT, \t address: [e-mail]"
},
"rcpt_database": {
"pass": [],
"fail": ["invalid recipient"],
"msg": [],
"err": [],
"skip": [],
"human": "fail:invalid recipient",
"human_html": "fail:invalid recipient"
},
"rcpt_to": {
"pass": [],
"fail": [],
"msg": [],
"err": [],
"skip": [],
"recipient": [{
"address": "[e-mail]",
"action": "reject",
"msg": {},
"code": "DENY"
}],
"human": "recipient: [object Object]",
"human_html": "recipient: [object Object]"
}
}

[Federico Liva]

The mystery is revealed.

The problem was the domain was registered in the virtual domains of Poste, but in reality the site uses another email provider. I guess Poste was looking for the recipient in the local server instead of sending on the remote one, and in fact removing the domain from Poste everything works and the mail is sent regularly.

Thank you for your valuable support!