Based on our record, Pingly seems to be more popular. It has been mentiond 1 time since March 2021. 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.
If they're hitting the outbound SMTP servers, there's no way (at least that I know of) to protect the IP/servers via obfuscation with a service like Cloudflare etc. Email deliverability relies heavily on the source IP of the sending SMTP for reputation and is going to be viewable in the headers of an email. Also changing IPs isn't a small task unless you're sitting on a load of good reputation IPs that are... - Source: Hacker News / over 2 years ago
Walkie - Walkie is an online communication providing software that allows you to remain in touch with the other persons.
Missive - Team communication app now supporting FB, Twitter & SMS
Slack Voice Chat by Standuply - Easily record and send voice messages on Slack 🗣️
Mailtrim - Email lives forever!. Reinvigorate your emailing experience with the best free email client, the Mailtrim
Cord - One tap voice chat
Loop Email - Emailing for teams: Organize your Inbox into channels 💌