Issue after update

[Newbie_Wizzer]

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

 

[laurentiu]

421 56.domain.net out of connection slots

You have this error because you're sending faster than your smtp server can handle.
Check this: https://forum.mailwizz.com/threads/how-increase-speed-for-email-minute.6019/#post-38609