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I just want to suggest here for Sendy to block users who are using Disposable Temporary E-Mail Address like (https://www.guerrillamail.com/) and many more.
They opt-in just to get something and our mailing list become bigger and bigger.
What do you think?
Thanks for your suggestion, something I haven't got to it yet. There's already an existing thread for this suggestion. I'll be closing this thread and moving it to → Block Domains.