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

MF2020 · ‎04-06-2020

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

Townman · ‎22-08-2007

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?

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.

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JW · ‎09-11-2007

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