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SMTP Response: 535 Too many SMTP auth failures. Please try again later.

MF2020
Interested
Posts: 1
Registered: ‎04-06-2020

SMTP Response: 535 Too many SMTP auth failures. Please try again later.

Hi,

I'm using the latest version of Thunderbird on Windows 10.

Plusnet sent me an email on the 01-Jun saying that it was likely my email account had been compromised; they suggested I change my email password.

I logged into my Plusnet account and changed my account and email passwords.

Since then Thunderbird (and from today my iPhone) have been intermittently reporting problems when I attempt to send emails; it fails more often than not. The error is:

SMTP Response: 535 Too many SMTP auth failures. Please try again later.

 

SMTP settings in Thunderbird are:

Server: relay.plus.net

Port: 587

Connection Security: STARTTLS

Authentication method: Normal passwod

Username: My email address

 

Webmail is fine.

 

Does anyone have any ideas?

Malcolm

2 REPLIES 2
Townman
Superuser
Superuser
Posts: 20,254
Thanks: 8,239
Fixes: 105
Registered: ‎22-08-2007

Re: SMTP Response: 535 Too many SMTP auth failures. Please try again later.

Hi Malcolm,

A warm welcome to the forums.

Given your description, I would guess that the party who have compromised your account are still trying to access it with the old password.

 

@JW - can you advise please?

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.

JW
Plusnet Staff
Plusnet Staff
Posts: 314
Thanks: 100
Fixes: 24
Registered: ‎09-11-2007

Re: SMTP Response: 535 Too many SMTP auth failures. Please try again later.

That looks to be the case. It will, most likely, resolve itself when whoever has been trying to use it realises that the details are now failing. Given that could take some time, I've flagged it to the team who looks after these things to see if there's anything they can do in the short term to stop the IP addresses that have been trying to use your account from accessing the platform.

 Jon W
 Plusnet