yahoo.gr relaying denied

Yahoo! has a strange delivery problem lately (last week?) for yahoo.gr recepients..

$ host -t mx yahoo.gr
yahoo.gr mail is handled by 10 mx1.mail.eu.yahoo.com.
yahoo.gr mail is handled by 10 mx2.mail.eu.yahoo.com.

While mx2.mail.eu.yahoo.com accepts mail as expected …

$ telnet mx2.mail.eu.yahoo.com 25
Trying 77.238.177.142...
Connected to mx2.mail.eu.yahoo.com (77.238.177.142).
Escape character is '^]'.
220 mta101.mail.ird.yahoo.com ESMTP YSmtp service ready
helo banana.irc.gr
250 mta101.mail.ird.yahoo.com
mail from:<postmaster@irc.gr>
250 sender <postmaster@irc.gr> ok
rcpt to:<postmaster@yahoo.gr>
250 recipient <postmaster@yahoo.gr> ok
quit
221 mta101.mail.ird.yahoo.com

the other mx, mx1.mail.eu.yahoo.com doesn’t ..

$ telnet mx1.mail.eu.yahoo.com 25
Trying 217.12.11.64...
Connected to mx2.mail.ukl.yahoo.com (217.12.11.64).
Escape character is '^]'.
220 mta161.mail.ukl.yahoo.com ESMTP YSmtp service ready
helo banana.irc.gr
250 mta161.mail.ukl.yahoo.com
mail from:<postmaster@irc.gr>
250 sender <postmaster@irc.gr> ok
rcpt to:<postmaster@yahoo.gr>
550 relaying denied for <postmaster@yahoo.gr>
quit
221 mta161.mail.ukl.yahoo.com
Connection closed by foreign host.

Reported this using their Issues Form as a possible misconfiguration on their side, but no answer yet..

Anyone?

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