Unfamiliar email on my Thunderbird account and unable to SEND Outgoing emails. Have been working with Hughes.Net

I have an unfamiliar name on my Thunderbird account of g*******k@hughes.net (I do not know this account) and I am able to see the inbox of this email on my computer in Thunderbird. I have been working with Hughesnet as I was without email service since 11/17/25 and have just been able to now Receive emails since 11/25/25, but am unable to SEND outgoing emails. Hughesnet requested that I contact Mozilla support as to the outgoing email issue - and the unfamiliar name on my Thunderbird account. Please help with this situation. My email account with Thunderbird is t****k@hughes.net <i>duplicate of [/questions/1551815] thread</i>