I have a strange issue with my server (or my opencart store, not entirely sure which yet..). Every so often for the past couple of months I've noticed that some order confirmation mails sent by my opencart webshop are arriving at people's inboxes a month late.
example: someone placed an order through the shop at february 19th. I received a confirmation of this the same day at 11:35, right after the order was placed. The customer, however, received his confirmation on march 19th at exactly 11:35.
Question is.. how can I figure out why some mails are delayed like this?
I've looked at the exim queue, its just about empty.
Note: this doesn't happen with all e-mails, only some. Recipients seem to be mostly gmail addresses.
example: someone placed an order through the shop at february 19th. I received a confirmation of this the same day at 11:35, right after the order was placed. The customer, however, received his confirmation on march 19th at exactly 11:35.
Question is.. how can I figure out why some mails are delayed like this?
I've looked at the exim queue, its just about empty.
Note: this doesn't happen with all e-mails, only some. Recipients seem to be mostly gmail addresses.