We also experienced this when working with attachments. Only sent every second or third email. Without attachments its sending reliably. Is there any ETAs on when this is fixed? Our service completely relies on attachments in emails.
We suspect the assembly sequence (assembly of our product) may be the problem. But it is hard to check it in a test environment. So I cannot say right now that the problem has been fixed 100%.
We need more time to monitor the behavior of our servers.
Sorry for inconveniences.
Our QA team will check this feature before each release. Also this check included to “smoke tests”. We still try to localize cause of this problem but if it occurs again we will locate it right after release and will be able to take appropriate measures.
This appears to be broken again…
Sometimes an attachment goes through, but if attachments are removed it goes every time.
One just came, it took 90 minutes for it to leave backendless and hit my smtp server
Our QA team have checked the work of a mailing with attachments. End everything works fine.
It can be related to the smtp server itself. We work with gmail and with our custom smtp.
What smtp do you use ? Can you create a test account for us ?