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free-email-forwarding
The best free email forwarding for custom domains. Visit our website to get started (SMTP server)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can setup SimpleLogin to forward messages to mailboxes but also there's a beta feature where you can reply to those forwarded messages and it will reverse the alias. https://github.com/simple-login/app
If you have Cloudflare manage your domain and are willing to manage the MX and TXT configs yourself you can do this completely for free through Cloudflare and https://forwardemail.net (completely free tier)
Mailway works well for this. mailway.app