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Unable to receive emails from

I do not receive emails from senders with an email address of the form <name>

An example of the sender's failure report is:

Reporting-MTA: dns;
Arrival-Date: Wed, 27 May 2020 18:31:52 +0100
Received-From-MTA: dns; (

Final-Recipient: RFC822; <>
Action: failed
Status: 4.4.7
Remote-MTA: dns;
Diagnostic-Code: smtp; 250 2.1.5 Ok

My email server sees the BT mail server connect, but does not receive any data:

2020-06-09T12:04:00+01:00 <myserver> postfix/smtpd[7356]: connect from[]
2020-06-09T12:04:01+01:00 <myserver> postfix/smtpd[7356]: Anonymous TLS connection established from[]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
2020-06-09T12:04:01+01:00 <myserver> postfix/smtpd[7356]: A33018C5A8C:[]

2020-06-09T12:09:01+01:00 <myserver> postfix/smtpd[7356]: timeout after DATA (0 bytes) from[]
2020-06-09T12:09:02+01:00 <myserver> postfix/smtpd[7356]: disconnect from[] ehlo=2 starttls=1 mail=1 rcpt=1 data=0/1 commands=5/6

Is this a problem at the BT end, or my end?

If it is at my end, can anyone suggest what I should do to fix it.

Thanks for your help

I can receive emails from other domains without a problem.

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