https://support.mozilla.org/kb/vacation-response

Hi, It does not solve my problem, I need change something like "Encoding".. You will see more in the atachment in the query.

As stated in the support article, Thunderbird has no way of creating an automatic 'out of office' reply. You'll have to use the means your email providers offers. Check with them.

I understand, bud i created a filtre rule: when I receive email, It will sand auto reply, everythinkg works Fine, but that mail, that is automatically send had bad encoding, that is the fail. And I dont know ho to repaire it :(

Probably fix your default SMTP server in account settings to be the same as the open used for other email.

I wrote the initial copy of that support article more than 10 years ago, I still will counsel anyone asking about using an out of office responder to not use the filter as you may well find yourself blocked as a SPAMMER as the filter does not know who you have responded to. So if you are away a day and get 20 email from the same person and each gets a reply out of office, next thing you know they will have clicked a spam button in their mail client and all your mail to them will be SPAM.

Server side vacation responders will send a single response per email sender, a filter will not.

Hi Matt,

thank's for reply, but i do not understand how do you mean it, or what should i change in settings of SMT (more in attachment). Could you please help me ? Nobody probably give me to the smam, it is company mail, and senders / receivers are mostly my colleagues. When first reply arrived to them, they will know, that I am out of office and they wont be sending mail's me anymore.

I have set secure SMTP with that I am sending mails normally, and encoding is OK.