what is the history of the hardware/machine/unit?
was it new-in-factory-sealed-packaging when you received it?
how did the unit function with the pre-installed operating system(if any)?
how does the unit function while using another/various-other distros(livecd/livedvd/liveusb)?

if you run low on space(partition mostly full, for example) things sometimes misbehave.

i don't use sylpheed but do use gufw and am interested in your mediation and conclusion(s)

i have briefly reviewed these but nothing jumped right out:
ttps://sylpheed.sraoss.jp/doc/faq/en/sylpheed-faq-2.html
ttps://sylpheed.sraoss.jp/doc/faq/en/sylpheed-faq-2.html#faq-account-setup
ttps://sylpheed.sraoss.jp/doc/faq/en/sylpheed-faq-2.html#d0e1067
ttps://sylpheed.sraoss.jp/doc/faq/en/sylpheed-faq-2.html#d0e937

i use the gufw default home profile which denies all incoming and allows all outgoing
(sometimes make a temporary rule to allow seeding but that is quite infrequent)

you might enjoy this presentation:

Nezha RISC-V Linux SBC running debian - via - ExplainingComputers
ttps://www.youtube.com/watch?v=613yEF6SrNo

@boughtonp, what was that ctrl_del_del supposed to do exactly? it didn't do anything unless there were lines/words after the cursor, in which case it made two deletions. thanks in advance!

@aluma, re your reply "I do it differently, I just paste the URL into the Quick reply window, the forum itself adds the url tag to it."

here is a link to one of your recent posts where the URL is truncated and, as such, in a screenshot it is impossible to know what the real complete URL is(hopefully this makes sense and helps to explain more fully what was explained earlier):
https://dev1galaxy.org/viewtopic.php?pid=48767#p48767

nevertheless, thanks for the thoughts and posts!

had a moment and curiosity got the best of me

ttps://radicale.org/v3.html

that webpage has an incredible amount of information
(good to take it all in when you have the time, especially the "about" section)

also of additional note:

attempted to visit one of the links on that webpage:
ttps://openports.se/productivity/radicale

and failed to find anything related to radicale but there was a notice dated 20230130 at ttps://openports.se/

@oui(and for future readers of this thread), EasyOS is _not_ whatever "easy linux" you might be referencing(for the record)

links:

ttps://easyos.org/

ttps://distrowatch.com/table.php?distribution=easyos

re OP and re HARDWARE... nice!

you might enjoy this commentary:
ttps://sdf.org/?faq?BASICS?02

re backup/clone/copy/etc tool(s), we happily pay for and use:
ttps://partedmagic.com/

(have used and trusted PartedMagic throughout it's existence, in the early days it was no-charge but now it is well-worth the small fee!)

re kingston ssd

we're also using 120gb-ssd from various name-brands and have only had one expire/drop-dead so far(knocking_on_wood) over 7 years.
(still operating under the consideration that at any moment it/they will go dark forever...always a little unsettling whenever it does happen)

running Beowulf and Chimaera machines presently but with the direction of linux/systemd/wayland/redhat/microsoft/etc will need to move to something else eventually(another learning curve...sigh)

@Ron,

when you have the time, review of Michael Horowitz works/websites is sometimes educational and always thought-provoking.

ttps://www.michaelhorowitz.com/

ttps://www.michaelhorowitz.com/second.router.for.wfh.php

regarding cabling, connectors, and physical ports, it is good to establish their correct and complete functioning and connectivity

i have a second-hand laptop that has a damaged ethernet port(sold to me that way, unbeknownst to me...sigh) and it works properly if you jiggle it in a certain way a bit(the poor connection shows as a 100Mbps and after some jiggle it will usually become correct at 1000Mbps).

also i grabbed a random webpage as an example:
ttps://forums.tomshardware.com/threads/getting-10-100-instead-of-1000-mbps-network-speeds.1710132/

9 out of 10 stand-up comedians approve of this thread
(even Steve Harvey admits to going commando on the Family Feud set)

as an aside, why are mericans so uptight...twisted knickers et al.