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I had similar problems. On top of that, I forward my email through my own server to GMail (so I control the domain, but can use the GMail ecosystem as UX), and

I had similar problems. On top of that, I forward my email through my own server to GMail (so I control the domain, but can use the GMail ecosystem as UX), and this was posing problems because GMail would greylist my server quite a bit for sending in too much spam. I now run rspamd on my own server, which does a pretty great job. With properly training the bayes filters it has, I now receive on the order of 3 spam messages per day in GMail. Actually, rspamd seems to have fewer false positives than the GMail spam filter -- I guess this could be because it has more information as the original receiver, though? Getting these results did take some very limited tweaking of the rspamd configuration; I lowered the treshold for what's "definitely" spam (that is, just gets discarded), and I bumped the weight of the BAYES_SPAM rule.

emilburzo 10y ago
Just wondering, do you have SRS setup on your email server? I ask because I had the same problem, with the same setup (own domain forwarding to gmail), adding SRS (besides the obvious SPF/DKIM/DMARC) has really improved things for me.
- dochtman 10y ago
  Yeah, I have postsrsd set up now, although I only set it up after setting up rspamd. I'm not sure why it would improve things without also setting up a spam filter? In that case, you're just lowering the reputation of your own server by passing on a lot of spam while acting as if you sent it.
  - emilburzo 10y ago
    > I'm not sure why it would improve things without also setting up a spam filter? I don't know the rules by which emails are judged, I'm just saying what I've noticed. Before SRS, I occasionally got legit mail marked as spam. After that, I don't think I've ever had one marked as spam. As I said previously: with my own domain, forwarded to my gmail.com address, no spam filtering at all on my side. Maybe they can tell it's SRS and skipping some penalties? EDIT: I'm also monitoring my domain at https://postmaster.google.com https://postmaster.google.com, but I'm probably not reaching significant traffic thresholds because I've never seen anything other than: "No data to display at this time. Please come back later. Postmaster Tools requires that your domain satisfies certain conditions before data is visible for this chart. "
tempestn 10y ago
Actually, that's the exact situation I'm in as well. So to clarify, the spam that gets through rspamd lands in gmail's spam folder, so you still need to manually check that, but all the obviously-spam stuff has been cut out before it ever got to gmail (solving both your problems). Sounds like exactly what I asked for! Interesting your mention about being grey-listed too. How did you determine that happened? Presumably the same thing could happen to me as well. Guess I should also check out SRS as mentioned by emilburzo.
- dochtman 10y ago
  rspamd has three levels of handling, depending on the spam score: (1) ham, which gets passed through, (2) spam, which does not, and (3) "not sure", which gets passed through but gets headers attached with the spam score and how the score is built up. So I get (1) and (3) in my GMail account, but all the stuff for which rspamd is confident it's spam no longer makes it into GMail. Of course, rspamd lets you tweak the thresholds for these levels. For example, after a while I lowered the threshold for "spam", increasing the amount of stuff that gets discarded by rspamd, because I noticed that rspamd was doing a pretty good job of scoring, and the false positives I was seeing had a lower score anyway. I'm actually not sure grey-listing is the correct term, but I noticed in my server's MTA log that Google was rate limiting me a lot because my server was sending through significant amounts of email. This was also noticeable sometimes because it would take quite some time for email to get through, which I found annoying. Yes, you probably want to run SRS as well, otherwise GMail will be unable to correctly understand your headers. However, this effectively puts your server on the hook for any email forwarded; this is why I don't think you want to go there without also putting some kind of spam filter in place, otherwise I assume your server's reputation will deteriorate.
  - emilburzo 10y ago
    Have you ever had a legit email marked as spam by rspamd? And is there a way to (manually) double-check those?
    - dochtman 10y ago

emilburzo 10y ago

Just wondering, do you have SRS setup on your email server? I ask because I had the same problem, with the same setup (own domain forwarding to gmail), adding SRS (besides the obvious SPF/DKIM/DMARC) has really improved things for me.

dochtman 10y ago
Yeah, I have postsrsd set up now, although I only set it up after setting up rspamd. I'm not sure why it would improve things without also setting up a spam filter? In that case, you're just lowering the reputation of your own server by passing on a lot of spam while acting as if you sent it.
- emilburzo 10y ago
  > I'm not sure why it would improve things without also setting up a spam filter? I don't know the rules by which emails are judged, I'm just saying what I've noticed. Before SRS, I occasionally got legit mail marked as spam. After that, I don't think I've ever had one marked as spam. As I said previously: with my own domain, forwarded to my gmail.com address, no spam filtering at all on my side. Maybe they can tell it's SRS and skipping some penalties? EDIT: I'm also monitoring my domain at https://postmaster.google.com https://postmaster.google.com, but I'm probably not reaching significant traffic thresholds because I've never seen anything other than: "No data to display at this time. Please come back later. Postmaster Tools requires that your domain satisfies certain conditions before data is visible for this chart. "

tempestn 10y ago

Actually, that's the exact situation I'm in as well. So to clarify, the spam that gets through rspamd lands in gmail's spam folder, so you still need to manually check that, but all the obviously-spam stuff has been cut out before it ever got to gmail (solving both your problems). Sounds like exactly what I asked for! Interesting your mention about being grey-listed too. How did you determine that happened? Presumably the same thing could happen to me as well. Guess I should also check out SRS as mentioned by emilburzo.

dochtman 10y ago
rspamd has three levels of handling, depending on the spam score: (1) ham, which gets passed through, (2) spam, which does not, and (3) "not sure", which gets passed through but gets headers attached with the spam score and how the score is built up. So I get (1) and (3) in my GMail account, but all the stuff for which rspamd is confident it's spam no longer makes it into GMail. Of course, rspamd lets you tweak the thresholds for these levels. For example, after a while I lowered the threshold for "spam", increasing the amount of stuff that gets discarded by rspamd, because I noticed that rspamd was doing a pretty good job of scoring, and the false positives I was seeing had a lower score anyway. I'm actually not sure grey-listing is the correct term, but I noticed in my server's MTA log that Google was rate limiting me a lot because my server was sending through significant amounts of email. This was also noticeable sometimes because it would take quite some time for email to get through, which I found annoying. Yes, you probably want to run SRS as well, otherwise GMail will be unable to correctly understand your headers. However, this effectively puts your server on the hook for any email forwarded; this is why I don't think you want to go there without also putting some kind of spam filter in place, otherwise I assume your server's reputation will deteriorate.
- emilburzo 10y ago
  Have you ever had a legit email marked as spam by rspamd? And is there a way to (manually) double-check those?
  - dochtman 10y ago