

idea of requiring attribution is specifically called out in Section 7, item B.
But requiring that the logo be retained is not.
Now, it’s not entirely clear what they even are asking for. If the ask is that the OnlyOffice logo be included in a ‘credits’ page (which is perhaps a reasonable interpretation of “you must retain the original Product logo when distributing the program”) then it is much less problematic, although perhaps still beyond requiring attribution, than if they are trying to demand that, say, the favicon of the webapp must not be changed (especially if their intent is also to say that you can’t distribute the program if you don’t change the favicon because it would be a trademark violation).
Now of course, if they have written all of OnlyOffice in house, and not had any external contributors or used any external copyleft code, then they can re-license OnlyOffice on whatever terms. If they were bound to the licence by including other people’s AGPL contributions, then they have to follow the licence themselves, and cannot add arbitrary additional restrictions.















I host my mail server on a VPS.
I suggest making sure you get DMARC / DKIM / SPF working, and having an anti-spam strategy (greylisting helps, but there are a few ASNs that just exist to send spam). Also make sure your IP is not on any public spam list.
The next problem you might face is that Microsoft and especially Google like to make it hard for anyone not using their services. With Microsoft, you fill in a form and jump through some hoops and they’ll start accepting your email enough to land it in spam. Unless you are regularly sending to Microsoft, it is hard to keep them accepting mail, but just sending to a free Hotmail address (owned and occasionally marked as read and deleted by you!) on cron is enough to keep occasional mail deliverable as long as none of your mail ever gets marked as spam. Google can be more of a pain to small email servers in terms of not landing in spam, but I think occasional reports of not spam will help you.
In terms of keeping down spam:
#!/bin/bash -e TEMPDIR=$(mktemp -d) trap 'rm -r "$TEMPDIR"' EXIT curl https://archive.routeviews.org/oix-route-views/oix-full-snapshot-latest.dat.bz2 -Lo "$TEMPDIR/snapshot.bz2" bzgrep -e " (15828|213035|400377|399471|210654|46573|211252|62904|135542|132372|36352|209641|7552|36352|12876|53667|138608|150393|60781|138607) i" $TEMPDIR/snapshot.bz2 | cut -d" " -f 3 | sort | uniq > $TEMPDIR/badranges iptables -N BAD_AS || true iptables -D INPUT -j BAD_AS || true iptables -A INPUT -j BAD_AS iptables -F BAD_AS for ROUTE in $(cat "$TEMPDIR/badranges"); do iptables -A BAD_AS -s $ROUTE -j DROP; doneNote that of the spam that gets through if you have the basic defences, it’s probably a similar level to big corporate hosted mail, so don’t let this deter you (I just hate spammers).