Generally, I will respond to your email within 24 hours, and usually much faster than that if I'm awake. If you haven't received a reply within this timeframe, one of the following is possible:
Verify that your email domain (or the TLD of the domain) is not one of those:
If your domain was explicitly banned, this is because your domain previously sent me mail that was classified as spam, either by myself or by the spam filtering tool.
If your domain falls under one of the banned TLDs, please contact me so that I can whitelist your domain.
Bluesky and Mastodon! I usually cross-post to both accounts, so feel free to follow only one or both! (I obviously cannot cross-post replies, though...)
The Twitter account that I have is only used because I can't see tweet replies without signing in. There will be no posts and messages will go unanswered. For all intents and purposes it doesn't exist.