SMTP Error (535): Authentication Failed
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- SMTP Error (535): Authentication Failed
Re: SMTP Error (535): Authentication Failed
16-09-2025 5:00 PM
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@TonyParker that matchs @-Simon- 's experience ... and I suspect matches my theory which I have escalated.
If you have an IMAP client configured on a local device, it should all work fine.
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Re: SMTP Error (535): Authentication Failed
16-09-2025 8:24 PM
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Add me to this issue also.
Re: SMTP Error (535): Authentication Failed
16-09-2025 9:05 PM
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Works with a local client, fails with webmail?
In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links
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Re: SMTP Error (535): Authentication Failed
17-09-2025 8:34 AM - edited 17-09-2025 8:35 AM
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I have the same problem - just tried to send an email. I can login to Webmail just fine, but sending emails raises the SMTP authentication error.
Edit: this is using a plus.com address.
Re: SMTP Error (535): Authentication Failed
17-09-2025 9:46 AM
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Happens on webmail, Unable to try with a client at the moment . Same this morning.
Re: SMTP Error (535): Authentication Failed
17-09-2025 9:49 AM
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Just to let you know... I am unable to login onto the Plusnet portal also. I am an email customer only and I think It only allows broadband customers on that. I used to log in on the MADASAFISH portal and it seems that this is still active. However, ther is no reporting funcationality
Re: SMTP Error (535): Authentication Failed
17-09-2025 9:50 AM
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Same for me.
Re: SMTP Error (535): Authentication Failed
17-09-2025 9:50 AM
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Reporting email issues
Can EVERYONE reporting "me too" issues please provide the following information...
- Email brand - Plusnet / Force9 / Free-inline / ic24 ... etc
- The email client being used
- How authentication (if any) is being done with the SMTP server - email address or account name
- Mail box type - Default or Primary
Force9 and webmail I am presently gathering diagnostics from my own tests so more Force9 and webmail posts are not necessary.
In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.
Re: SMTP Error (535): Authentication Failed
17-09-2025 11:23 PM
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- Email brand - IC24
- The email client being used - Microsoft Outlook 365 and Plusnet Webmail
- How authentication (if any) is being done with the SMTP server - Email Address
- Mail box type - Default
Re: SMTP Error (535): Authentication Failed
20-09-2025 4:28 PM
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I get the same issue
- Email brand - IC24
- The email client being used - Plusnet Webmail
- How authentication (if any) is being done with the SMTP server - Email Address
- Mail box type - Default
Is their any update on this item?
Re: SMTP Error (535): Authentication Failed
21-09-2025 7:59 AM
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I've just checked again and things are the same for me too.
- IC24
- Plusnet Webmail fails, Outlook and Android mail now send fine.
- I don't think that I can control authentication on Plusnet Webmail.
- Not relevant
Re: SMTP Error (535): Authentication Failed
22-09-2025 4:43 PM
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@TonyParker wrote:
I've just checked again and things are the same for me too.
I don't think that I can control authentication on Plusnet Webmail.
In general, you can in the same way you do for any other login - use the email address or the account name ... though for ic24 IIRC email address is the required credentials ... other brands will accept either.
@plusnettony - is there any update on the ic24 issues please?
In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.
Re: SMTP Error (535): Authentication Failed
22-09-2025 7:00 PM
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Re: SMTP Error (535): Authentication Failed
on
22-09-2025
9:07 PM
- last edited on
22-09-2025
10:09 PM
by
Mav
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HI
I have the same SMTP 535 problem
my email is [Removed]
Any help would be appreciated
joe mitchell
Re: SMTP Error (535): Authentication Failed
23-09-2025 5:06 PM
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I am and IC24 user, and I have the same (535) error occurring.
I've not been able to send emails since last week (but receive emails ok)
This started the evening prior to the outage they had on Wednesday last week (17th Sep)
I spoke with PN Customer Services (Shauna - who was brilliant, really informative and helpful)
She told me about the PN 'global' webmail outage, and that she thought the send issue was lnked to that.
It seems its not, as I have been patient, and waited, but cannot send any email (not even to my self at IC24)
Can anyone advise, as having to cut/paste/manage issue using alternate email address, but its not ideal!!
Many Thanks, Robbie
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