how to stop pop up every time when opening eMclient:" cannot send message (e-mail recipient not accepted by server)"
You will need to delete the message that is waiting to be sent, that has the incorrect address.
You will find it in the Local Folder Outbox. If Local Folders are not visible below your other account folders, you can enable them by selecting Menu > Settings > General > General > Show Local Folders.
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Hello Gary, I randomly have issues with calendar acceptance replies being stuck in my Outbox. Nothing appears in the actual email outboxes, just under “Local Folders” Outbox. I see the path in your Reply from 2022 but I believe it must have changed as there is no “Show Local Folders”.
<edit: I located the Local Folders setting, now General | Folders, makes sense>
Also, per another recommendation from the helpful Community Advocate @cyberzork, I checked the logs and there were no errors under the “Errors” but under Logs I did find this:
“3:17:22 PM Navy [AirSync] MailClient.Accounts.ConnectionException: Found invalid data while decoding.”
Why would the address be bad if it’s directly replying to something that was sent (thus, a correct, known address)? The reply address is/was correct so is it just data corruption?
Sure, deleting might solve the immediate issue of getting rid of the nuisance error message when you go to close eM Client but does it solve the issue with actually sending the intended reply?
Thanks,
Al
I just noticed I could edit my post. Duh.
@gary @cyberzork I didn’t think to try this before closing out my original post. After deleting the email stuck in the local outbox folder, I cleared all logs, closed the client and re-opened it again.
While the Outbox warning message has cleared, I still see a lot of errors (rows of data related to the AirSync functionality, I only posted the first line) but I’m not smart enough to interpret what the entries means - so maybe it wasn’t related to the stuck Outbox issue. Thoughts.
Attempting to troubleshoot, I cleared the logs again and de-selected AirSync, closed and reopened eM Client. Doing so cleared the glut of errors with the Log file (not the actual Errors section).
Then, I re-enabled AirSync and closed/reopened the client and the “3:53:49 PM Navy [AirSync] MailClient.Accounts.ConnectionException: Found invalid data while decoding.” paragraph returned as before. I dropped it into Excel and it’s 49 lines of information.
I don’t see that it’s affecting anything per se but time will tell. I’d rather not go through dumping the email account and restoring it again.
Thoughts?
Thanks guys,
Al
[AirSync] MailClient.Accounts.ConnectionException: Found invalid data while decoding.”
That error has been a random problem for some Outlook users. See @Olivia_Rust post link below.
Also make sure you are using the latest version of eM Client via the release history page just incase you have an older / outdated version.
Ps For me personally with my own Outlook account, ive only ever seen that error twice randomly in 2 years and carn’t replicate it to send in for testing. But if you can replicate it, then there is an email address in the above Announcement link where you can then do testing if you are willing.
Thanks Cyberzork. I did check for an update before posting.
As I was editing my reply adding more information (second post) I didn’t see you had jumped on my question - you are FAST! 
As long as I can send/receive, I’m good as there are no apparent errors and at least I know what to do but I can’t seem to reveal the local account (which used to be at the very bottom of all the email accounts). Had I not activated “Favorites” I wouldn’t have been able to see/solve it.
Regarding what the trigger is/might be, I hadn’t paid attention to whether or not it’s happening with regular replies but this was second time a automated reply-back to a calendar appointment got stuck.
Of note, when I’m actually in the calendar view, there is a red-triangle warning that can’t be cleared. So, perhaps, it is impacting my calendar in ways I’m not seeing.
PS - this is fairly new to me in terms of seeing the error. I know you’re super busy with replying to everyone but you and I were collaborating in December about the Yahoo failure to sync and subsequent removal of the CardDAV and CalDAV. I only shifted to @live.com so I could at least use one calendar (which has never been my primary - it has always been @yahoo.com).
Since December, it’s happened a couple of times to me (stuck local account outbox).
Well… It seems like I’m going to have to again uninstall my @live account and reinstall it. I now have confirmed that not only can I not create calendar events and have them sync to the MS account, I just now tried sending an email from my @live account and it’s also stuck in the local outbox (just as the auto-reply calendar event).
Curiously, it’s only a one-sided problem. I can receive emails but I can’t send them (or sync anything).
This is embarrassing as I just finally convince a friend of mine to join the eM Client user team. She won’t have the patience for all of these problems. This is a disappointing development.
I just now tried sending an email from my @live account and it’s also stuck in the local outbox (just as the auto-reply calendar event).
If emails are contantly getting stuck in the outbox and you don’t have really large file attachments with them, sometimes that can also be related to eg: optionally installed Antivirus programs scanning the outgoing mail delaying them, or optionally installed firewall / security programs sometimes interferring or VPN’s. So if you have anything like that installed other than what comes default with your OS. try completely disabling those to test incase of interferance.
However if you don’t have anything like that installed or disabling makes no differance, then yes probably need to remove and readd the account and see if that fixes that issue.
Hey brother, thanks for the good input. I’m good to go on all that but if I weren’t I’d certainly try all those things as they are very solid suggestions.
I could have had this problem the whole time and not known it because over the last few months (December/January) I’m not on the PC much and this particular account is my “Navy only” account and I haven’t been sending anything from it more than likely because I’m doing it on my phone.
Discovering that I’m going to have to start all over again (dread), I do have a question for you because it’s about 8GB I’m about to re-download for the 4 or 5th time (takes days as for some reason EMC times out).
Now that I have problems seemingly more often I’m backing up my DB.
While I used to work in IT, as I get older I’m getting less inclined to tinker and more reluctant to spend a lot of time solving my own IT issues (if you don’t stay up to date, you’re lost). Is there any way to target just my @live account from within the backup to reinstall (I have 3 accounts)?
And, if not (likely so), how do I go about restoring everything (I hate overwriting what isn’t broken). Is it simply File | Import? I apologize for being lazy and asking the question without trying. Who knows, maybe with the process I get to choose.
Lastly, are you part of the eM Client team? You seem to really know your stuff and are all over everything. Like Gary. God bless you for being seemingly 24/7?
Respectfully,
Al
Is there any way to target just my @live account from within the backup to reinstall (I have 3 accounts)?
You carnt selectively just restore a specific account from within the backup.zip file.
It restores everything if you do that, but then will only download new messages since the restore point. So would be quicker than removing and readding like brand new again if your live account was ok at the time of the last backup.
Lastly, are you part of the eM Client team? You seem to really know your stuff and are all over everything.
No I don’t work for eM Client. Just an end user.
Dude, you rock! Personally, respectfully and with sincerity, I really appreciate your dedication to the Forum 