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Emails bigger than 1 Mb are disconnected by yahoo.com

P

paco68

New Pleskian
Recently I have an interesting problem with the emails that are be sending to Yahoo.com.
All emails that are bigger than 1 Mb are disconnected by yahoo.com

(deferral: Connected_to_98.137.54.237_but_connection_died._(#4.4.2)

Emails are still in queue.

The interesting part is that All emails under 1 Mb even with multiple attach files are delivered successfully.

My main IP is not blacklisted and I using Domain keys too.
I tried with Postfix and Qmail and the problem persist.
I send requesting help from Yahoo, but no answers yet.

Somebody with the same issue ?
 
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