Hello, Somebody could tell me if I have any chance to adjust Inbox messages characters size whose source contains: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Messages coming sent with the above format are not adjustable in characters size by Thunderbird: they stay the same and too small for reading. I say this because if the format of source message is different, as for example: Content-Type: text/plain; charset="windows-1252"; format="flowed" Content-Language: en-US Content-Transfer-Encoding: quoted-printable Then the size of the characters size is adjustable and adequate for an optimal reading. I remember this is a very old problem of Thundebird I faced from the very beginning many years ago. Thanks, -- Marco Calistri Build: openSUSE Tumbleweed 20210408 Kernel:5.11.11-1-default Desktop: XFCE (4.16.0)