If the network you connect from is also used to send spam, then your computer may end up with an Internet address that has been banned from using e-mail. Simba Hosting tries to prevent this from happening by not banning any computer that has recently succesfully supplied an e-mail username and password. If you are banned then the first time you may get an error message but on further attempts you may not be able to connect at all. You can remove any block from your computer by visiting https://www.simbahosting.co.uk/mail-unblock.php – if this does not work then your problem is something else.
Posted in: Questions concerning e-mail