BT is one of the world's largest providers of telecommunications services and solutions, with operations in more than 170 countries.
Infrastructure
Region |
Europe, Middle East and Africa (EMEA): United Kingdom |
Domains |
btinternet.com; btopenworld.com; mybtinternet.com; talk21.com |
Connection and throughput |
BT does not disclose connection and throughput limits. |
Complaint feedback loop (FBL) application |
None |
Postmaster site |
Deliverability best practices and troubleshooting support
- Ensure you follow BT's best practices.
- Use opt-in permission methods for all subscribers. Do not purchase email lists or engage in list harvesting from third-party websites.
- Have a list hygiene strategy in place to remove or suppress unknown and unengaged users from your email list.
- Use a consistent From and friendly-from address to make it easier for subscribers to identify your email.
- Configure all IPs with valid reverse DNS (PTR) records.
- Authenticate all email with SPF, DKIM, and DMARC.
- Do not use a dynamic IP address. Send email to BT from a dedicated or shared IP address.
- Implement a prominent unsubscribe link in all email with a one-click unsubscribe process and immediately honor all unsubscribe requests.
- Deploy different mailstreams (e.g. transactional and marketing mail) from different IP addresses and From addresses .
- BT relies on content-based filtering.
- Make sure the message subject line matches the message content.
- Use a combination of images and text in your email as BT does not display images by default. Be sure your email can be understood with images turned off. Image-only email is likely to be filtered as spam.
- Send content your subscribers want to receive. A high number of subscribers deleting your email without reading or marking them as spam causes delivery issues.
- Monitor SMTP response codes closely for clues on delivery issues.
- According to BT, senders fixing problems surfaced by their SMTP response codes "have no problem sending email to BT customers".
- BT does not disclose which blocklists are used in filtering decisions, but you should ensure that your IP addresses and domains are not listed on any important blocklists.
Mediation
- Send an email to postmaster@btinternet.com for delivery issues. Be sure to include a summary of the issue, you sending IPs, domains, SMTP error messages, and any steps taken to correct the issue.