Direct Mail might be a bit more popular than Sanebox. We know about 1 link to it since March 2021 and only 1 link to Sanebox. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I see no specific issue with sanebox.com, however it appears that they are only offering a service you can do on your own. Honestly, do you really get that much SPAM? Source: over 1 year ago
Another option, for Mac users: Direct Mail (https://directmailmac.com). Disclosure: I work there. - Source: Hacker News / over 2 years ago
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