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Knowledgebase : Technical Help > IceWarp version 11 > Sending Emails
 

In case you are using lot mailing lists with expected frequent change of subscribers amount, following scenario might be helpfull for you. Its written for separate mysql database called e.g. mailing_lists with two tables, first table ml_addr is for storin...
Symptom: Messages are stuck in the server's outgoing queue. SMTP log shows there is a permanent error 554 when IceWarp tries to send the message to the recipient's server. Cause: The receiving server may reject the message if it does not comply with RFC...