Setting up outgoing mail on Android device using O2 SMTP server

[Anonymous]

Hope somebody can help me, my main email account is a Karoo one, I have set this up to receive incoming mail with no problems.

However I have never been able to set up outgoing mail, I have followed what appears to be the general advice on the internet which is to set the outgoing settings as follows:

SMTP server:   smtp.o2.co.uk

Port:                    25

Security type:  None

Require sign-in:  ticked

Username: My O2 username

Password: My O2 password

When I click 'Done' it comes up with a box displaying 'Checking outgoing server settings' for a few seconds and then comes back with the following:

"! Could not finish

The server does not support the authentication methods"  with an option to 'Edit details' which when clicked takes me back to the outgoing settings and I note that it always changes the Port back to 587.

Any help gratefully accepted!!

[MI5]

It is from an an android perspective.

[MI5]

K9 is another good mail app.

[Anonymous]

I have tried several apps, including two of those mentioned above. The fact remains that, to retain my primary address as a "send" address, I need *either* to be on my own LAN wifi and use the (unauthenticated) broadband provider's outgoing SMTP, *or* be on 3g/4g and use the (unauthenticated) smtp O2 server. I have yet to find a means to use WAN and retain my primary (non-Gmail) email address as the apparent sender.

To overcome the need to change the settings depending on whether at home or on the go, I have TWO email clients, both of which receive, one of which successfully sends when I am on LAN and the other of which successfully sends via 3g/4g, but not vice versa, and neither works when on WAN.