so i've been messing with Winlink for about three weeks now and i think i have a decent handle on it but the RMS gateway stuff is still kind of fuzzy to me. like i get that the gateway is basically the relay between my radio and the Winlink servers but im not totally clear on when to use a dedicated RMS Express session versus just connecting through whatever gateway is closest on the frequency finder thing.

my setup right now is an IC-7300 feeding into a SignaLink USB, running Vara HF. i managed to send a test message to myself through a gateway about 80 miles away on 40m and it went through fine, took maybe 45 seconds total which seemed pretty fast honestly. but then i tried again the next day on 20m and kept getting the handshake starting then just dropping. not sure if it was propagation or if i had the wrong mode selected in the session settings.

also kind of confused about the message handling side — when i receive mail through Winlink does it just sit on their servers until i connect and pull it, or is there some way to get notified without having to manually poll? and what happens if my outgoing message doesnt get acknowledged, does Winlink retry automatically or do i have to manually resend. sorry if these are dumb questions ive been reading the Winlink documentation but it gets pretty dense

not dumb questions at all, this stuff confused me for a while too. the RMS gateways are just store-and-forward nodes basically — your message goes radio to gateway, gateway uploads to the CMS (common message server) over the internet, and sits there until the recipient connects and grabs it. so yeah it just waits on their servers, there's no push notification unless you're using something like a winlink hybrid network with a local telnet connection but thats a different thing.

on the failed handshake issue, 20m can be really finicky especially mid-day depending on where you are and what time you're trying to connect. the Vara HF waterfall should show you whether you're actually seeing the gateway signal before you try to connect — if it looks clean and you still drop, could be a timing issue in your VARA settings or the gateway was just busy with another session. only one connection at a time per RMS node so if someone else grabbed it first you get bumped. try a different gateway, the RMS relay list in Winlink Express updates pretty regularly and you can sort by distance and band.

as for retry, Winlink Express will usually let you know if the session failed and you can manually retry, it doesnt auto-retry silently as far as i know. the message stays in your outbox until you get a confirmed transfer so at least you wont lose it.

yeah the 20m drop thing has bit me too, i think sometimes its just the gateway being busy like the other guy said. one thing i do now is check the RMS list and pick two or three candidates before i even start a session so if the first one doesn't connect i can just swap frequencies and try the next without fumbling around. also make sure your clock is synced, VARA is pretty sensitive to system time being off even by like a second or two and ive had weird handshake failures traced back to that.