Please don't indent your text. "I recently changed my ISP. Lets say my old ISP was X and my new ISP is Y. My new ISP does '''NOT'''(?) have an email account that comes with the service where my old ISP did - I didn't know this at the time when I changed ISP's. Since a lot of my friends are connected to my old email address, I kept it by opening a dial-up account with ISP X. I am having problems sending out emails, all incoming emails are fine. I have changed my SMTP to what the new ISP Y has posted, but this is for Outlook not mozilla. I have contacted both X and Y support. X claims it is SMTP settings, Y claims it mozilla, hence the request for support. When I goto my sisters place, she has a different ISP from X and Y. I change the SMPT settings and boom, I can email out. As you can see from the image it looks like a password problem, but I have placed both the passwords from X and Y in there and neither work. When I goto my sister's place, I only change the SMPT, not the password and it works. Hopefully someone can work this out for me, please/thx" You almost certainly have discovered that you can't use Y's SMTP to send messages using X's account (and maybe vice versa). This arrangement used to be the standard way of doing things, but for various reasons, email service providers have become more picky about who can send via their network. Some allow it, some don't. Your sister's ISP appears to be one of those that do. The usual get-around would be to use X's SMTP to send using X's account, but that requires that X can authenticate you despite you connecting via Y's network. And it requires that Y allows you to use someone else's SMTP server - a few ISPs make this difficult. For you to be able to use X's smtp server, you need X to be operating an "authenticating smtp server" which takes a login and password from you, so it knows you are a bona fide customer of theirs. Some ISPs rely on you connecting via their network, and so authenticate you via your login to their internet service. Progressive and professional ISPs recognize that you may move around and connect from multiple locations. I stopped using ISP-provided email many years ago. Just too much hassle (as you are finding) and often a patchy or somewhat primitive service. ISPs seem to be moving away from running their own email service; more and more we see it being farmed out (if it's offered at all) to some third party such as gmail, yahoo or even outlook. Use any of these (who all use authenticating smtp servers) and you will rarely have these problems, and neither would you have to fiddle with smtp at different locations. Smtp/pop/imap are standardised and the settings will work in any email client. Any help aimed at a specific email client is usually intended to help locate the settings in that client; the values you use will be the same, regardless of email client. Microsoft do use some particularly idiosyncratic terminology, but I think that's just part of their general policy to lock-in their customers. In your position, I would set about detaching myself from that old address. Your friends can learn and businesses will have routes whereby you can inform them of changes. The part that tends to drag on and on is all those sites where you used your email address as a login. :-(