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They should all work well with Gmail, since it's the most popular recipient, and all popular solutions have deliverability statistics. I'd guess that using Gmai

• Scramblejams 11y ago
  But can we use that for arbitrary domains that aren't operating under the Google Apps system? Been looking but haven't found the answer so far. Edit: Looks like you can, but Google says it's "not recommended." Also, you need to be a paying Apps member to use the service from what I can tell. Not sure if you can if you aren't a paying member.
  • tyingq 11y ago
    https://support.google.com/a/answer/2956491?hl=en https://support.google.com/a/answer/2956491?hl=en Scroll down to Step 6, where it shows "Any addresses (not recommended)" Apparently, it works, but with some notable caveats, like: "If the envelope sender is not in one of your domains, the system changes the envelope sender from user@[domain you don't own] to postmaster@[your domain]"
    • Scramblejams 11y ago
      Cool. But do you need to be a paying Apps member to do this?
      • tyingq 11y ago
        >>But do you need to be a paying Apps member to do this? The issue would likely be the limit on messages per day. Google spells this out for paying Apps members (https://support.google.com/a/answer/2956491#sendinglimitsforrelay https://support.google.com/a/answer/2956491#sendinglimitsfor..., see "Limits Per Customer") They don't say what the limit is if you're using SMTP relay as a regular gmail user. I suspect it's much lower.