I use Mozilla Thunderbird as my e-mail client and with that I use 4 e-mail addresses. My main e-mail is thro Plusnet and the others thro gmail.com. All works fine and well. However just lately I am taking my laptop to my son in laws house and using his Virgin Media connection to access the internet and email. All my G mail accounts work as well as they did at my home address. Plusnet account receives e-mail but I cannot send them. I have accessed https://portal.plus.net/support/email/setup/thunderbird-smtp.shtml and set-up the account as shown there. I have re-booted the laptop several times but still cannot send. Have you guys any suggestions?
That should work ok AFAIK. You could try port 587 instead of the normal 25. Some ISP's can block port 25 although I didn't think VM did!. You could also try using a username of the form username+mailboxname and the mailbox password ( as used for Webmail ) since that is supported now.