E mail will not send when away from home router

[#1]

Long standing problem that I phone 7 will not send e mails when away. All normal settings checked and historic posts looked at. The message is that recipients e mail address rejected by server. Any further ideas please?

[#2]

Do you have 'Use Authentication' set for the outgoing server ( relay.plus.net ) ?

[#3]

Thanks for your very fast reply.

When we go to authentication it offers 4 options, MD5, Challenge-Response, MD5 Digest, HTTP MD5 Digest, NTLM or Password. Which should we use as when we 'tick' password it doesn't seem to be saved as the option? Thanks.

[#4]

That doesnt sound right. I'm not familiar with Apple Mail ( I assume that's what you are using on the iPhone ) but there's a guide here https://support.apple.com/en-gb/HT201320

[#5]

Hi and thanks again. It is an Apple mail account host but a plus net mail account. The Apple  guide doesnt' really help unfortunately hence coming back to the community.

[#6]

It is an Apple mail account host but a plus net mail account

I'm not quite sure I understand what you're saying there.

If you are uising Apple mail to access your plsunet mail account, then using the guide, you add a new mail account but use the details for your plusnet account. The Plusnet settings are here https://www.plus.net/help/email-guides/how-to-set-up-plusnet-email/ in the  'What other settings do I need' section

[#7 · Accepted solution]

With iPhone setup. you can / need to specify the username and password on the SMTP server settings.  I am somewhat surprised that you were able to configure the email account without them.

[#8]

Hello @brookorchard, thanks a lot for getting in touch. I know it sounds like a simple question but, have you enabled mobile data for Apple Mail? 

[#9]

@adam945 

Good call!!

[#10]

Yes, mobile data has always been on. I'm not quite that bd a technophobe. In any event, problem now resolved.

[#11]

Thanks but the account has been set up for years with the Plusnet settings. The issue has now been resolved.

[#12]

Thanks. The account has worked perfectly (other than with the problem I have identified) without the username and password but having now added these the problem has been resolved so many thanks.

[#13]

When you connect to the outbound server from "off" the Plusnet network - as in 3/4/5G mobile network - you MUST use the username and password on the SMTP server.  When on the network - as in connected over wifi to your home router - you do not need then credentials.

For the very issues you have encountered, it is wiser (certainly simpler) to always specify them.