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550 5.7.25 error: no PTR record (Gmail)

Gmail's 550 5.7.25 means the IP that sent your message has no reverse DNS (PTR) record. Add one that matches, or have your provider set it.

Sender problemYou are the problem: your domain, IP, authentication or content. Fix that before sending more.

What 550 5.7.25 means

Gmail550 5.7.25 The sending IP address doesn't have a PTR record

Gmail requires the sending IP to have reverse DNS, and this one has none.

List problem or sender problem?

Sender problem. It's your sending IP's DNS setup. It's a permanent failure: the server won't accept this message if you send it again unchanged.

How to fix 550 5.7.25

  1. Add a PTR (reverse DNS) record for the sending IP.
  2. Make the hostname it points to resolve back to the same IP.
  3. On a hosted sending service, ask the provider: they control the IP's reverse DNS.

In SendingOS, 550 5.7.25 shows on the conversation with its reason and code. If bounces like this pile up on one domain, a domain health rule can pause that domain's inboxes before the whole campaign suffers.

Not sure whether a spike in bounces is the list or the domain? Read High email bounce rate? Burned domain or bad list.

421 4.7.0550 5.7.26

Sources: Google: Gmail SMTP errors and codes

Questions

Can I add a PTR record in my domain's DNS?

No. Reverse DNS belongs to whoever owns the IP address, usually your hosting or email provider. Ask them to set it.