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Outlook Gmail Port numbers (IMAP & SMTP)
DevOps & SysAdmins: Fix error on postfix (Build to smtp server) (2 Solutions!!)
DevOps & SysAdmins: Postfix SMTP Relay Configuration Error (2 Solutions!!)
DevOps & SysAdmins: Postfix - SMTP mail delivery failed with "Connection timed out" error
![SMTP-e-mailfout 550 5.7.1 - Hoe op te lossen [OPGELOST]](https://i.ytimg.com/vi/O72SfhI_HEs/hq720.jpg?sqp=-oaymwEjCOgCEMoBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLAOnvuGSPrTgU-u4nJa41CgoHBAYg)
SMTP-e-mailfout 550 5.7.1 - Hoe op te lossen [OPGELOST]
DevOps & SysAdmins: Postfix smtp redirected and not sending
DevOps & SysAdmins: Postfix SMTP server: errors from
DevOps & SysAdmins: Postfix SMTP auth not working with virtual mailboxes + SASL + Courier userdb