We have one client overseas that we communicate with regularly, and emails from staff on both sides get through just fine.
We also have a browser-based application that we supply to them (like all our other clients) that sends out email reminders of tasks that their staff need to complete. These emails are not always getting out to the intended recipients, and through a series of test, we have narrowed down a few possible conditions that might be getting in the way.
- General emails with no attachments go through fine
- Emails with a MS Word (.docx) attachment and an iCalendar attachment (.ics) go through fine
- Emails with just an iCalendar (.ics) attachment are being "dropped"
- All of these emails, when sent to other mail recipients in other domains, work as expected.
A sample of a dropped email from the SMTP-Activity log:
Code: Select all
11/15/16 16:31:13 SMTP-OU AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI 1572 194.170.19.83 CONN 220 adpapsmtp01.adwea.ae ESMTP 0 32 sysadm@bcms.co Assignment of Compliance Task: Email test #3; Compliance Condition:
11/15/16 16:31:13 SMTP-OU AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI 1572 194.170.19.83 EHLO EHLO mail.bcms.co 250-adpapsmtp01.adwea.ae 19 60 sysadm@bcms.co Assignment of Compliance Task: Email test #3; Compliance Condition:
11/15/16 16:31:13 SMTP-OU AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI 1572 194.170.19.83 MAIL MAIL FROM:<notifications@bcms.co> SIZE=3938 250 sender <notifications@bcms.co> ok 45 39 sysadm@bcms.co Assignment of Compliance Task: Email test #3; Compliance Condition:
11/15/16 16:31:13 SMTP-OU AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI 1572 194.170.19.83 RCPT RCPT TO:<xxxx@transco.ae> 250 recipient <xxxx@transco.ae> ok 33 42 sysadm@bcms.co Assignment of Compliance Task: Email test #3; Compliance Condition:
11/15/16 16:31:13 SMTP-OU AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI 1572 194.170.19.83 DATA DATA 354 go ahead 6 14 sysadm@bcms.co Assignment of Compliance Task: Email test #3; Compliance Condition:
11/15/16 16:31:33 SMTP-OU AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI 1572 194.170.19.83 DATE . - 3947 0 sysadm@bcms.co Assignment of Compliance Task: Email test #3; Compliance Condition:
===================================================================================
A sample of the same dropped email from the SMTP-Debug log:
Code: Select all
11/15/16 16:31:12 ME-I0123: Domain [transco.ae] has MX list [mail83.transco.ae,mail84.transco.ae]
11/15/16 16:31:12 ME-I0026: [AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI] Sending message
11/15/16 16:31:12 ME-IXXXX: [AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI] DNS resolved to the following record: IP Address=194.170.19.83, Family=2, Type=1, Protocol=6
11/15/16 16:31:33 ME-E0010: [AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI] Outbound Error receiving response from remote server (error 10060) after 19147 milliseconds. Server Response: (-). System timeout value is a maximum of 1000000 milliseconds.
11/15/16 16:31:33 ME-I0148: [AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI] DATE (DATA Termination) command failed with network error.
11/15/16 16:31:33 ME-E0029: [AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI] DATA Command Failed. Transmit File: Communications Error Transmitting File to transco.ae.
11/15/16 16:31:33 ME-E0033: [AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI] DATA Transmission failed.
11/15/16 16:31:33 ME-E0048: [AFE919A7FD3E4C09919CEBFFB2FD4D03.MAI] - Transmission errors occurred during delivery. Message has been re-queued.
- ME-I0049: Send Completed Successfully (times).
- ME-I0074: [1572] (Debug) End of conversation
===================================================================================
Are there any suggestions as to what to look for or what to modify in order to prevent these emails being dropped in the future, or is it something on the receiving end that needs to be altered?
Thanks,
Adam Finster
