[Dovecot] Timeout when receiving messages with attachment

[spart cus]

Hi guys,
 just recently got a problem with my mail server. My clients are comlaining that whel receiving theyre emails after 7 mails received suddenly the connection has timeout. Another scenario is with attachments. Sending 1MB of attachment is not a problem, but receiving this attachement is. Suddenly it timeout for some while. Anyone has a solution for these ?
 
 tnx
 
			
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