RESOLVED - 20260122 - Office 365 down today
Not receiving email at Office 365? Here is Microsoft's update on their situation.
https://x.com/MSFT365Status/status/2014432216852340823
We are actively queuing emails for our Office 365 customers which should be delivered as soon as Microsoft is able to restore services.
Update: As of 01:00 UTC 23 January 2026 error rates for delivery to Microsoft 365 have dropped considerably.
Update: As of 03:00 UTC 23 January 2026 all of the queued emails for delivery to Microsoft 265 have been delivered.
We welcome any feedback. Thank you for being a ETRN customer. Please contact us if you have any questions.
We Answer Your Questions: FAQ
Q: What is the maximum e-mail attachment size?
A: The ETRN.com e-mail servers do not limit the size of individual e-mail attachments. The ETRN.com e-mail servers do impose a 400 MB maximum total message size limit. Individual customers can choose a smaller message size limit. We can also customize the handling of "oversized" e-mails. Please contact us to discuss your specific needs. A couple of important facts:
1. Attachments are typically encoded in what is called Base64[1]. As a result, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original file size.
2. E-mails often contain both plain text and HTML components. This also increases the overall size of the e-mail.