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Some Mail not sending in iOS 16

Hi, I am having a very big problem with the mail app in iOS 16. I have two emails set up and when I reply to a email, it can’t send, it just goes straight to my outbox and a error message says server not found. I tried everything, I looked to see if my server for the emails is turned on and it is and I also re-added my two emails again and it still did not fix the problem. I did not change anything about my two emails since I had iOS 15. In iOS 15, did not have these problems but now I do. This is definitely a iOS 16 problem.

iPhone 13 Pro

Posted on Oct 7, 2022 9:19 AM

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158 replies

Jul 25, 2023 8:59 AM in response to Metro287

Similar issue. However it "sends", I hear the swoosh. it disappears, But then it is not in the sent folder, not in the drafts, not in the outbox, no where, and I follow up with intended recipients, they didn't get the email. this seems to happen more with forwarded and replied emails than new created but happens with all. this is a HUGE issue especially when work time related emails... claiming "but I sent the email!!!"

Jul 25, 2023 10:32 AM in response to churchie70

churchie70 wrote:

Similar issue. However it "sends", I hear the swoosh. it disappears, But then it is not in the sent folder, not in the drafts, not in the outbox, no where, and I follow up with intended recipients, they didn't get the email. this seems to happen more with forwarded and replied emails than new created but happens with all. this is a HUGE issue especially when work time related emails... claiming "but I sent the email!!!"

I’ll assume you didn’t read the thread you posted to, so I will summarize it.


  1. If you are in the habit of force-closing mail, don’t. Or if you absolutely insist that you must for some reason that goes far beyond the recommendations of Apple’s engineers not to, leave mail open until the “undo” send times out (default: 10 seconds)
  2. If you still must force-close mail and can’t wait 10 seconds after sending, go to Settings/Mail, scroll to the bottom, and set Undo Delay to None.

Aug 22, 2023 5:32 AM in response to Metro287

I am having an issue where I will reply to an email, hit send. It appears to go through, and then days later when I wonder why no one has replied it is because the email never went through. No trace of it at all. Not in drafts, not in outbox, nothing. At first I thought ok, maybe I didn't send it. But now that it's happened probably 25 times since the update, I know its not me. It's causing issues with my job. It doesn't do it every time. Only sometimes. I don't think it has to do with closing the app immediately because most of the time it works. But on the occasions where it doesn't its a MAJOR issue. Apple, PLEASE FIX!

Aug 30, 2023 7:30 AM in response to Metro287

Same here, replying or sending emails, there is the sound as sent, then checking in sent and the email is not there, also the outbox is empty, and also the recipient/s are not receiving the emails.

This is frustrating as there are some important messages that are lost!


The workaround I am using is to put myself in cc. so far is working.. issue is that i do not always remember to do that and long important emails not sent are really upsetting.


PS: as you can read, i am checking if it is sent etc. the app is not closed soon after sending! that's a major bug!


I am going to change app to microsoft. I had this issue last year, then seemed solved and now again.

Some Mail not sending in iOS 16

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