How do I control the retry intervals in the SMTP outgoing queue?

Retry intervals in the SMTP outgoing queue

The Outgoing queue for sent mails from the Icewarp Mail Server is controlled by:

• file \Icewarp\Config\interval.dat (if it exists)
• Undeliverable Warning after X hours

The first attempt at delivery is always just after the message enters the queue.

The default retry intervals (if no interval.dat file exists) are as follows:

• Retry # 1 - 2 minutes later
• Retry # 2 - 10 minutes later
• Retry # 3 - 38 minutes later
• Retry # 4 - 70 minutes later
• Retry # 5 - 120 minutes later
• Retry # 6 - 120 minutes later
• Retry # 7 - 120 minutes later
• Retry # 8 - 120 minutes later

After the 8th retry, the same retry interval will be used until the undeliverable after (Days) threshold is reached (Set in Main Menu > Mail tab > General)

The delivery reports can also be changed in Main Menu > Mail tab > General . Here you can also set the "Undeliverable after" and the "Warning after" values.

Note that for certain "immediate" errors these retry values are ignored and Icewarp retries after 6 hours. If this retry fails a message is sent to the sender informing him of the problem but Icewarp keeps retrying for 4 days. If the message still cannot be sent, the sender is informed.