Hi, in my website I use the typical contact form, where users can ask more sending an email and in which they can leave their email address. Using the webmail, everything works fine: I receive their email and clicking on reply, my reply email goes to them. Using Thunderbird (128.4.3esr (32 bit)), my replies never reach the users, they are sent in fact to the "To" email address (so, I receive my own reply). Viewing the source code of the email I receive from my website, I can correctly read the line "Reply-To" with the user email address. Please help me, thank you in advance Davide