Are you running any of the SpamSieve betas? Supposedly the ones from the last few weeks (v 2.9.34b4 came out 3 weeks ago) include major improvements to Apple Mail in Mojave.
Be sure to check out the app’s support forum, where the developer is very active.
Thanks. I’m running 2.9.34 final release – it’s unstable on Mojave over here.
I’m running 2.9.34 w/ Mojave 10.14.1 and have had no problems. Seems to be running fine.
Strongly advising against a plan that does anything more than the SaneLater filtering. I have tried (ala MacSparky) to set up a system for deferring mails and several were deleted (I am not alone in this, I am the author of one of the aforementioned threads). Support proved abysmally incompetent. The SaneLater filtering is GREAT but do not use Sanebox for anything more than that. Use Spark or Airmail or whatever power user app for any other specific needs.
I’ve been using SaneBox for years and really like the service. Though, they don’t provide a spam filter (at least not in the traditional sense). You’ll find more info on their website:
Hmmn. I’m running SpamSieve 2.9.34 w/ Mojave 10.14.1 and haven’t had any crashes at all. Might be time for an uninstall and reinstall?
I run spamsieve under Mojave. Rock solid. No problems
I’m running SpamSieve on Mohave and I haven’t had any issues as well. (Mohave 10.14.2 beta 3 and SpamSieve 2.9.34
How many messages total stored in oyur Apple Mail accounts?
Reason I’m asking is that I was having many mail crashes and I also run SpamSieve. However, once I got the total number of messages below 50K stored the crashes have stopped. I’ve been slowly cleaning and archiving my reference and sent mail folders.
FWIW after trying multiple automated archiving solutions I ended up redoing it all over again in a DEVONThink Database. I do not use their automatic import mailbox tools as they choke on mailboxes with 20K messages or more.
My biggest problem with SpamSieve is that I could never train it to “mark as good” group email from people in contacts. I finally just shut it down and began using icloud.com as my email domain. I never see unwanted email. My understanding is that Gmail is just as good in that regard.
Appears that SmallCubed’s new Mail Suite conflicted somehow with SpamSieve. Uninstalled Mail Suite. SpamSieve is working fine again.
Same for me - no problems with SpamSieve and 10.14.1. I bet there’s some corruption in the OS. Please try to reinstall the OS.
My email address is public on my website so I get a lot of junk even though it is with Gmail. Does anyone have experience with using SpamSieve with Gmail? Is there any benefit or would it be a waste?
I figured as such. Thank you.
I access my gmail accounts using Pop so I use SpamSieve’s e-mail features exclusively. No problems and it workes well. Gmail always flagged good mail as spam and I can’t “whitelist” senders because I get so many new contacts. But when you get lots of e-mail talking about semen, breeding, heat detection etc. basically no spam filter works well. They all tend to think you’re getting porn. And you also get a LOT more porn spam than the average user.
I’m glad to hear that it seems like this is now resolved, and there are no known issues with the current version of MailSuite and SpamSieve. However, I don’t recall or see anything in our automated crash reports or e-mail support records about a crashing issue. If you experience crashes again, please don’t hesitate to contact us.
With the default settings, SpamSieve automatically accepts all messages from addresses in the macOS Contacts. Also, when you train a message as good, all future messages from that address will be classified as good, unless you subsequently start training them as spam. This is very simple and reliable. But if you have any questions or issues with this, please contact me.
The most common problems are:
The “Use macOS Contacts” feature won’t work if you deny SpamSieve access to Contacts in System Preferences > Security & Privacy.
If a server spam filter, another Mail rule, or another computer/device moves the messages to the Spam mailbox, SpamSieve by default won’t fish the good messages out of Spam (though there is a way to do make it do that if you want).
Some people find that Gmail’s filter works really well for them, and in that case that may be all they need. However, a large fraction of SpamSieve customers are using it alongside Gmail because Gmail is either missing lots of spams or putting their good messages in Spam.
It’s important to train SpamSieve if a message slips through. Otherwise, it will incorrectly learn that the message is good. Training SpamSieve will mark the message as spam on the server, and it can also move the message to the server Spam mailbox, so this will train Gmail at the same time. Whereas, training Gmail alone will not train SpamSieve. When it’s running on your Mac, SpamSieve can protect all your devices, and you can train it from iOS if you’re away from your Mac.
If moving a message out of the inbox on your Mac does not move it out of the inbox in Gmail (regardless of whether it was moved by you or SpamSieve), something is wrong with the Mail/Gmail setup or syncing. The contents of the mailboxes should match between the two.
You realize you’re communicating with the app’s developer, don’t you? 
Do you also know there’s an active support forum for the app?