Hi Michiel, thanks for your reply. We have performed a series of rollbacks but have not been able to identify the culprit. The three principal items in the mix are an upgrade from 3.0.8 to 3.0.12, a test of a custom rewrite of the Segmentation plug-in that was provided by Duncan Cameron and a specific email that seems to fail each time. We turned on verbose logging but it doesn’t provide much help.
By the way, do you perform your throttling and batch processing in Postfix or in phpList? If in phpList, how do you compensate in case your ISP access goes down? When it comes back up, the emails flood out without benefit of the throttling and batch processing.
Anyone else have any thoughts?
Thanks.