I have a couple of email lists for projects - between 200 and 800. Best tip for growing it - write regularly and have a subscribe button in the email itself.
My newsletter "Le Courrier du hacker" lecourrierduhacker.com is a weekly digest of the activity of the French-speaking FOSS community.
I reached 2k+ subscribers with already 76 issues. Open rate is around 55%. To offer to access the content to people disliking newsletters, I have public archives outside my email provider (Mailchimp) mostly to have a better control of my content. I also have accounts on social networks Twitter twitter.com/courrierhacker and Mastodon framapiaf.org/@lecourrierduha…
To grow the audience, I tried to publish relevant content in the french-speaking FOSS community - my readers - in order them to join. I also blog about it on a regular basis. The first 1k subscribers were quite easy to get, now it's more difficult to grow and these days I try partnership with other french newsletters or blogs or websites to exchange visibility.
The quickest way is to buy an email list and just cold mail the users. Sure, this could be considered spam so I don’t really recommended but a friend from college bought a 20K email list to promote his calculator app and he got 500 paid downloads.
One of the things I did to get my first 600 for LFGChat was posting a link to a landing page on reddit, forums, telegram groups and pitched my idea. For my surprise, I got a good feedback and reception.
Now with Remotelist I made a “subscribe” mailing list in the home webpage, and after being featured on PH and Betalist I got around 300 emails.
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