# region 2** status E200 = "250 Message accepted for delivery" E201 = "250 SL E201" E202 = "250 Unsubscribe request accepted" E203 = "250 SL E203 email can't be sent from a reverse-alias" E204 = "250 SL E204 ignore" E205 = "250 SL E205 bounce handled" # out-of-office status E206 = "250 SL E206 Out of office" # if mail_from is a IgnoreBounceSender, no need to send back a bounce report E207 = "250 SL E207 No bounce report" E208 = "250 SL E208 Hotmail complaint handled" E209 = "250 SL E209 Email Loop" E210 = "250 SL E210 Yahoo complaint handled" E211 = "250 SL E211 Bounce Forward phase handled" E212 = "250 SL E212 Bounce Reply phase handled" E213 = "250 SL E213 Unknown email ignored" E214 = "250 SL E214 Unauthorized for using reverse alias" E215 = "250 SL E215 Handled dmarc policy" E216 = "250 SL E216 Handled spf policy" # endregion # region 4** errors # E401 = "421 SL E401 Retry later" E402 = "421 SL E402 Encryption failed - Retry later" # E403 = "421 SL E403 Retry later" E404 = "421 SL E404 Unexpected error - Retry later" E405 = "421 SL E405 Mailbox domain problem - Retry later" E407 = "421 SL E407 Retry later" # endregion # region 5** errors E501 = "550 SL E501" E502 = "550 SL E502 Email not exist" E503 = "550 SL E503" E504 = "550 SL E504 Account disabled" E505 = "550 SL E505" E506 = "550 SL E506 Email detected as spam" E507 = "550 SL E507 Wrongly formatted subject" E508 = "550 SL E508 Email not exist" E509 = "550 SL E509 unauthorized" E510 = "550 SL E510 so such user" E511 = "550 SL E511 unsubscribe error" E512 = "550 SL E512 No such email log" E514 = "550 SL E514 Email sent to noreply address" E515 = "550 SL E515 Email not exist" E516 = "550 SL E516 invalid mailbox" E517 = "550 SL E517 unverified mailbox" E518 = "550 SL E518 Disabled mailbox" E519 = "550 SL E519 Email detected as spam" E521 = "550 SL E521 Cannot reach mailbox" E522 = ( "550 SL E522 The user you are trying to contact is receiving mail " "at a rate that prevents additional messages from being delivered." ) E523 = "550 SL E523 Unknown error" E524 = "550 SL E524 Wrong use of reverse-alias" E525 = "550 SL E525 Alias loop" # endregion