From "Marc" <m...@f1-outsourcing.eu>
You can add to this, that gmail actually is also losing email and annoying is 
that you can't send zip files. I am constantly asking people to give me a 
different email address.
Yup! And it's not too difficult to pull messages out of the Spam folder and put them back into Inbox. That is, if the message makes it into the Spam folder and isn't rejected.

I don't know if it still works but I have had people send me zip files to my gmail acct by renaming them as like .tip or .zap or something. Frankly it's better to share such potentially large files in a link like from dropbox, onedrive, or any one of a number of similar things.

I don't like any daemon connecting to my mail storage. Can you imagine if your 
solution gets hacked, how much data would be compromised? I prefer messages 
being scanned/marked before stored. I wonder if this is even gdpr compliant, 
because you can access private data constantly.
First, for people like yourself, you would want to run such a daemon yourself on your own infrastructure, hence why I am thinking of this could be useful to other people as open source.

Second, there are plenty of people who don't run their own email, as in, gmail users, that entrust their email to google. Though GDPR probably has something to say about such a service, I doubt it would be impossible under GDPR, especially EU users using a suitable EU server and whatever rules necessary were followed.

Why not just forward messages? Register a domain put some mx servers in front 
of gmails mx. I recently was testing with such relay/forward, works perfectly, 
I am only changing the envelope nothing else. DKIM, spf everyting perfectly 
working.

I'd be interested to know if anyone runs spamassassin forwarding from gmail back into gmail, how does this work? How to get it so mail isn't in a loop? You can't do what I'm talking about just by forwarding. More below on that.

So for the whole of Europe you need data processing agreement for accessing the 
mail storage as a 3rd party.
Probably, yes. Is it any different with a mail server that uses a back end scanner as a service? I know there are several such services for corporate email that work with a google workspace account that allows you to modify the mail routing which you can't do with a free gmail account.

I think this design is just wrong from the start. I have sometimes that we see 
that clients mailboxes are accessed from the digitalocean cloud because they 
granted access via their phone. Especially IOS is really insecure/bad with such 
privacy. It is just crazy giving access to your whole mailbox for maybe a 1 
time action on a incoming email.
I wouldn't say the design is ideal but I haven't seen any better way. I didn't find a way to do it by forwarding myself, maybe I missed something obvious? There's no way in consumer gmail to tell gmail to loop messages through some external service. I guess you could forward all messages and then use POP to "import" them back in. You wouldn't be able to manipulate folders like the Spam folder or set up spam-training and ham-training messages. I remain unconvinced just forwarding is the best way to do this.

You can argue that it's really crazy giving access to your whole mailbox to your email provider too. I guess I don't see the difference here. Your mail service provider could be broken into as well. Read about Microsoft's recent break-in?

I'm just wondering if there's enough interest in this to do the work to make it open source. If there were a lot of people mailing me saying "Yes! I've been looking for something like this but I don't want to run it myself!", then I'd consider making it into a service, as well as probably open sourcing it. Thing is, such a service has to minimally viable. So far, you're the only response I've seen to this and your response appears to be overwhelmingly negative.

In my own testing of this, my gmail Spam folder varies between 1500 and 5000 messages at any given time. Sometimes there's a false positive that no matter how many times I tell gmail it's not spam, mail from that user ends up in Spam. I also find gmail is not perfect and it misses 1-2 spams roughly every day that end up in my inbox. I have already pressed the spam button once this morning. I've spent quite a bit of time pulling down individual false negative messages and running them through spamassassin on my server and they almost always get scored highly as spam. So I personally find such a plumbing to be useful.

What I have is a plumbing that does the message manipulation and a bunch of other things which are not pertinent. Some of the hard work is done, it would still need some work to release to the world. Pulling messages out and putting them back in is not as easy as it sounds and I can honestly say the devil is in the details, but the good news is that part now works well. I am just trying to figure out what to do with it, if it's useful beyond family and friends, or if there is a more general interest in being able to use spamassassin on other providers such as gmail or yahoo. If there's insufficient interest, that's fine, I'll just use it myself.

Michael Grant

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