SMTP Error (535): Authentication Failed

[#1]

I have an @ic24.net email address and from some point this morning I am unable to send email via a mail client or via Webmail.

I am able to receive email fine via mail client and Webmail, but sending via either method fails with an SMTP authentication error.

The Webmail client gives the error SMTP Error (535): Authentication Failed and my mail client (iPhone native Mail app) gives a similar error (username or password incorrect)

I know there is some sort of mail migration going on and wonder if Plus.net haven't added the ic24.net domain to the list of authorised sending domains or something similar?

The last email I sent successfully was 09:23 this morning (15/09) and the next one I tried to send around midday failed, and I have been unable to send since.

[#2]

For the avoidance of doubt - you can login to webmail, receive but not send?

@plusnettony - has ic24 entered the migration programme?

[#3]

Thanks for the reply, yes I can login to Webmail, and login using my iPhone Mail Client and receive emails. Just unable to send via either method.

[#4]

You're not alone - I also use an ic24.net email address and have the same problem - Webmail or Outlook on Android/Windows in my case.

[#5]

Thanks guys, an ICScoland issue has been raised, suspect it is the same problem. If you're username isn't linked to your forum profile, can you PM it to me please. 

[#6]

I'm in the same situation. I have an IC24 email address and can receive emails on my android phone, webmail and Windows11 Outlook.

Since today I can't send emails from any of them.

[#7]

Hi

My email address is <Redacted>@ic24.net

All my outgoing emails stopped and I had issues with outlook on my laptop.

Moderator's note:
Personal information removed from a public forum (to an area that staff can see).

[#8]

Thanks all. anyone who hasn't sent me a username, how you've tried (i.e. client / webmail ) and times you attempted it, please do so and I'll forward on the examples. Thanks all.

[#9]

post deleted by user, posted on the wrong topic, sorry

[#10]

Can everyone reporting this issue please retest and advise if there are still issues.  An issue mitigation elsewhere might have also mitigated this experience.

Thank you.

[#11]

I have just tried sending two emails via the Webmail client, and received the SMTP Error (535): Authentication Failed message.  

BUT, I then tried sending an email via my iPhone native mail client and it sent fine.

Afterwards, I tried again using Webmail and it failed again so looks to be just Webmail that's not working now.

[#12]

My emails are now sending again. Thanks to whoever fixed whatever.

[#13]

I'll qualify my previous response, I've now checked webmail and that still failed with SMTP Error (535).

[#14]

@-Simon- thank you for the dual feedback - I have escalated the divergent behaviour.

@TonyParker is your failure with webmail or a local client?

[#15]

Webmail