Issue after update

Newbie_Wizzer

New Member
Hello,
After updating to the latest version i have seeing this error on delivery logs (giveup)

Expected response code 220 but got code "421", with message "421 56.domain.net out of connection slots " Log data: ++ Starting Swift_SmtpTransport << 421 56.domain.net out of connection slots !! Expected response code 220 but got code "421", with message "421 56.comain.net out of connection slots " (code: 421)

Anyone knows what this is and how to fix it?

Also the sending of campaigns has slowed down significantly

Thank you for the help
 
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