To prevent that, consider asking them for a perfect frequency, test heavily, and maybe ask those who unsubscribe for their reason.
Rule of Thumb: How Often to Send Your Newsletter
To get started, consider this rule of thumb, though:
- Everything less often than at least every other month is not often enough. People will forget about you, and the surprise of a newsletter from you showing up after a year will probably result in a surprise unsubscription.
- Everything more often than once a week is too often unless your subscribers specifically agreed more frequent mailings. People will get tired and annoyed by your emails, and unsubscribe even if they like your content.