It would be helpful to see what, if any, error code is returned by the SMTP server in this situation. From a desktop or laptop device open a Command Shell in Window or otherwise a Terminal. and enter the following where username:password is replaced with your email address and password, i.e. firstname.lastname@example.org:Y54kpX5g:
curl -v smtps://smtp.virginmedia.com -u username:password
Do not post the resulting output here but instead review it for possible reported causes, i.e. VM error code; choosing to ignore this advice and posting the output here unredacted or incorrectly redacted may reveal your email address, password and / or public IP Address.
FYI if there is no issue then you should see the following output from the curl command:
> AUTH PLAIN
< 235 2.7.0 SMTP350 Authentication successful for user [Redacted]
< 214-2.0.0 This is cmsmtp ESMTP service help
214-2.0.0 This is cmsmtp ESMTP service help
< 214-2.0.0 To contact postmaster send email to email@example.com.
214-2.0.0 To contact postmaster send email to firstname.lastname@example.org.
< 214-2.0.0 For local information send email to Postmaster at your site.
214-2.0.0 For local information send email to Postmaster at your site.
< 214 2.0.0 end of HELP info
214 2.0.0 end of HELP info
* Connection #0 to host smtp.virginmedia.com left intact
Otherwise an unsuccessful result will look similar to the following:
> AUTH PLAIN
< 525 5.7.13 Authentication Denied (VM320)
* Closing connection 0
* TLSv1.2 (OUT), TLS alert, close notify (256):
curl: (67) Login denied
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Sorry to hear of the email issues experienced sending emails via the iPhone mail app, we appreciate you raising this via the forums and welcome to the community.
Have you been able to get the information requested by 用心棒 in regards to supporting with this?