Hello,
We have changed servers and moved e-mail server to Exchange Online. After this sending of e-mails after making order became unstable: 50% of e-mails are failed.
I have an impression that Exchange Online has not very good support of SMTP. Are there other ways to send mails to Exchange Online?
Here is an error log form "Files\MailLog\.NET" folder:
[2/29/2016 2:24:17 PM]: Send using Pickup Directory Service failed. Trying SMTP protocol.
[2/29/2016 2:24:22 PM]: Error: Mail not sent.
[2/29/2016 2:24:22 PM]: Error: No valid SMTP host found. Please specify a valid SMTP host in Control Panel.
[2/29/2016 2:24:22 PM]: Error: The message was saved for reference. Filename is 'fe839bc8-beb6-4a75-95b0-0b4480ec8aec.eml'.
[2/29/2016 2:24:22 PM]: Send using Pickup Directory Service failed. Trying SMTP protocol.
[2/29/2016 2:24:22 PM]: Mail sent successfully using SMTP protocol. Recipients: '*********' - CC Recipients: - BCC Recipients:
[2/29/2016 2:46:08 PM]: Send using Pickup Directory Service failed. Trying SMTP protocol.
[2/29/2016 2:46:08 PM]: Mail sent successfully using SMTP protocol. Recipients: '************' - CC Recipients: - BCC Recipients:
[2/29/2016 2:46:08 PM]: Send using Pickup Directory Service failed. Trying SMTP protocol.
[2/29/2016 2:46:13 PM]: Error: Mail not sent.
[2/29/2016 2:46:13 PM]: Error: No valid SMTP host found. Please specify a valid SMTP host in Control Panel.
[2/29/2016 2:46:13 PM]: Error: The message was saved for reference. Filename is '43ffcd6a-50de-4b2f-9126-a319322e398c.eml'.