Hi, My thunderbird stop sending emails, after I changed my hosting from ixwehosting to hostgator. I am receiving email fine, but email on gmail, yahoo and some other domains have just stopped going. Thunderbird shows the message is sent but it never received on recipient email account. I have configured SMTP and POP3 settings as mentioned by hostgator and talked to their support but still emails not receiving. Moreover, I installed MailSpring application in my linux box and configured same hostgator settings in it and emails are receiving from it. Even from my mobile Android BlueMail the emails are received. It looks like some settings are in thunderbird cache that is causing this issue. I have changed my email account password, added it again in thunderbird, but it still showing same behavior. Can someone shed some light on this problem?