What is the minimum amount of email traffic needed for one IP?
To build and maintain a good sending reputation, an IP address needs a steady amount of traffic. If the volume is too low, mailbox providers (like Gmail or Outlook) may treat the IP as “unknown,” which often leads to spam folder placement.
Below 5,000–10,000 emails per month: Too little to establish a stable reputation.
10,000–50,000 emails per month: Enough to begin building a reputation if traffic is consistent and engagement is good.
50,000+ emails per month: Usually sufficient for ISPs to calculate and maintain a strong reputation.
Key points to remember:
Consistency matters more than bursts: sending steadily every week is better than large, irregular spikes.
Engagement is crucial: low volume can still work if recipients open, click, and rarely complain.
Idle IPs decay: an IP left unused for weeks or months may lose its reputation, requiring a warm-up again.
In short: aim for a few thousand emails per week per IP, sent consistently to engaged users.
Why does my DNS check still show the old IP after it was changed?
Either the MTA is still binding to the old IP or caching is in play (DNS or the test tool). Check the “Received:” headers to confirm the sending IP, force the new IP binding in your MTA, and retest with a fresh mail-tester address.
Can I change my dedicated IP address? Is there a cost?
Yes. Contact support to request a change. Swapping to a new IP costs €39. Changes can take up to 48 hours to propagate. After receiving a new IP, perform a proper warm-up (start low volume to engaged recipients and ramp gradually over weeks).
What does Gmail automatically link in my emails?
Gmail auto-links plain text addresses (opens Google Maps), phone numbers (on mobile, starts a call), and email addresses (opens a new compose window). This behavior is automatic in Gmail web and mobile apps.
What is the purpose of the X-Entity-Ref-ID header?
It helps prevent Gmail from threading transactional emails with the same subject/sender. Set a unique X-Entity-Ref-ID per message so each appears as a separate email.
Which SMTP ports are supported?
Use 587 with STARTTLS (recommended). 465 (SSL/TLS) is supported. 25 (Plain/STARTTLS) is supported but discouraged due to ISP blocking/throttling.
