Can only send PN emails on WiFi.

[#1]

I appreciate this had been covered before so I’m sorry for raising it again but I can’t seem to get my PN outward email working. I’m still with PN.

I’m receiving emails ok, but can only send them on my iPhone on the PN WiFi.
When I try to send emails while away from home on the 4 or 5g I get the error message “Cannot send email, the user name or password for xxx is incorrect”
My host is set as relay.plus.net
The user is set as my domain name
The use SSL is toggled
Authentication is set as password
Server port is 587

All these settings are exactly the same as they have been for ages. I’ve not changed my password. I did try changing the server port to 465 but that didn’t make any difference so I’ve changed it back to 587.

I have just returned from 2 weeks in Canada where I sent emails & looking at other similar threads this seems to be a factor & possibly some sort of block had been put on my email account.
If I have to I’ll phone PN customer services but the last time I phoned to ask when I was bring migrated the CSA told me I’d already been migrated. I haven’t, as I’ve never had a Greenby email & I tried logging into Greenby with a multitude of combinations none of which were recognised.
I do have domain name & webspace with PN so I believe I’m going to be one of the last stragglers to be migrated.
Any suggestions would be appreciated.
Thank you.

[#2]

SMTP Port 587 is used with STARTTLS  or NONE

SMTP Port 485 is always used with SSL/TLS

For Username the email address of the mail box is the recommended option.

[#3]

Correction to the port number :

SMTP Port 465 is always used with SSL/TLS

[#4]

Thank you for your reply, I’ve tried both the 465 & the 587 & neither will allow me to send on non WiFi.

My account settings won’t allow me to save the full email address under outgoing settings, just the domain name.

[#5]

Try with Apple Relay disabled, is that blocking your access over mobile data ?

Not being able to use the email address as Username hints the email address being used does not correspond to a mail box.

I have seen this before where from the past Plusnet customers have had a Catch All Enabled on their <account>@<account>.plus.com  default email and have just used E.g.  james.bond@<account>.plus,com
dispute there not being an real mail box of this name.

In the brave new world of Greenby the SMTP credentials will only be permitted to send emails where the From: email address matches the name of the email box or is a current alias of that mail box.

[#6]

Don’t want to sound thick, but where will I find the Apple relay please?
I can send emails on the WiFi, just not on mobile data. Mobile date is working fine & I’m receiving emails on mobile data too.
I knew about with Greenby it’s got to be the full email address in the settings, my husband encountered that.
I appreciate your help though, if all else fails I can still send my emails when I’m home on WiFi & also in PN webmail.

[#7]

You have the iPhone not me !

Are you quite sure the SMTP server is not set to Port 25 ?
To prevent spam sending, Port 25 is often blocked by ISP & mobile operators.

[#8]

Yup, definitely not 25, SMTP down as 587.

[#9]

You need to configure the outbound service as follows…

server: relay.plus.net

port: 587

encryption: STARTTLS

user name / password - the same as the incoming server.

Being able to send on network (wifi connected) but not when connecting over a mobile network points to one issue - you do not have valid credentials on the outbound server.  On network no credentials or invalid credentials will not inhibit the ability to send.

Apple interferences have no bearing here.