Sanebox might be a bit more popular than Direct Mail. We know about 1 link to it since March 2021 and only 1 link to Direct Mail. 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.
Another option, for Mac users: Direct Mail (https://directmailmac.com). Disclosure: I work there. - Source: Hacker News / over 2 years ago
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
Awesome Mails - Awesome Mails creates beautiful image map emails, featuring an easy to use drag-and-drop editor...
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
Unroll.me - Unroll.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.