Forum Discussion
550 5.7.501 Service unavailable. Banned Sender. - no help from Support
Hi
I've sent out less than 400 emails using SMTP today (while keeping in mind https://technet.microsoft.com/en-us/library/exchange-online-limits.aspx#Receiving%20and%20sending%20limits, so 30 mails every 62 seconds). Yes it's a once in a year peak but never the less within the limits of O365.
So I've been banned. Now I can't send the reaming 37 emails I should urgently send out and additionally while https://support.office.com/en-us/article/email-non-delivery-reports-in-office-365-51daa6b9-2e35-49c4-a0c9-df85bf8533c3?ui=en-US&rs=en-US&ad=US states "To restore this account’s ability to send mail, please contact support through your regular channel" support did not help at all but suggested to wait 24 hrs.
This is rather disappointing for a professional service! Please help!
Thank you
P.S. There are no account issues to resolve! I sent the emails I wanted to send!
30 messages over 62 seconds is very close, it would only take a small disagreement on the timing between Microsoft's calculation and the tool you are using.
Good point: But the program needs another 20-30 s to send the emails so it's actually much more (at least 80s per 30 mails)
Update: I've added a log which clearly shows I never as near the 30 mails per 60s limit:
Update2: Didn't work, so I put it on PasteBin: https://pastebin.com/EVRH4q1g
But is that additional equally spread between each message, Microsoft will only see the SMTP connections, maybe your app takes 30seconds to get ready before it starts sending the first SMTP.
Absolutely my personal opinion, but I would always aim for 50% or any threshold value and double any time estimate.
