I was afraid this was going to be the answer. Sigh.Sofie Van Landeghem schreef:Hm, did something happen to the ugent smtp server? It's not working anymore in thunderbird from inside the network here..?Indeed... and as we're still part of the UGent network (eg. Athena is reachable) and smtp.ugent.be is not down and is normally even accepting mails from outside of UGent network as well... I'd blame a new firewall rule inside PSB :-) smtp.psb.ugent.be is running smoothly :-p T.