Authentication, antispam and deliverability

1. Authenticate a Hostsuar domain in Brevo Explains how to copy the records Brevo provides into the authoritative DNS zone, avoid duplicate SPF or DMARC records and check that they validate publicly. 4 min · Reviewed 09/2026 →
2. What the DMARC reports you receive by email are Clarifies what DMARC XML reports contain, how to tell them apart from a bounce, change who receives them and spot unauthorised sending sources. 5 min · Reviewed 09/2026 →
3. SPF record for domains that do not use our DNS Gives the SPF mechanism to add in Cloudflare or other external DNS to authorise mail sent from Hostsuar servers. 2 min · Reviewed 09/2026 →
4. Changes to the requirements for sending email to Gmail and Yahoo Summarises Gmail's and Yahoo's current requirements on authentication, DNS, TLS, reputation and easy unsubscribe for regular and bulk sending. 4 min · Reviewed 09/2026 →
5. Review outgoing messages held by the spam filter Explains how to review in Imunify360 the outgoing messages held by the spam filter, view their content and decide whether to release or delete them. 3 min · Reviewed 09/2026 →
6. Set up your domain's DMARC record in cPanel Create your domain's DMARC record with the cPanel Zone Editor wizard: what to put in each field, a recommended configuration and how to check it works. 7 min · Reviewed 10/2026 →
7. Improve the SpamAssassin antispam: train it and use whitelists and blacklists Teach SpamAssassin by marking emails as spam or not spam from webmail, and add senders or whole domains to the cPanel whitelist or blacklist. 4 min · Reviewed 10/2026 →
8. Bulk email: preparing lists, authentication and unsubscribes Brings together the practices you need to send newsletters without damaging the domain's reputation, and when to use a specialised application or platform. 7 min · Reviewed 09/2026 →
9. Configure SpamAssassin: threshold, Spam folder and auto-delete Turn on cPanel's antispam (Spam Filters), choose whether spam goes to a folder or is deleted, lower or raise the score threshold and correct its mistakes from Roundcube. 4 min · Reviewed 10/2026 →
10. Add a safe sender in SpamAssassin Shows how to lower the SpamAssassin score of a specific sender address and explains why this list does not guarantee delivery. 2 min · Reviewed 09/2026 →
11. SPF and DKIM: what they authenticate and where to set them up Tell SPF, DKIM signing and DMARC alignment apart, and choose the setup that matches the service that sends your messages. 2 min · Reviewed 09/2026 →
12. BoxTrapper: sender verification and reviewing the queue Describes how BoxTrapper holds unknown senders until they are verified and how to manage its lists, confirmation messages and queue from cPanel. 2 min · Reviewed 09/2026 →
13. How to check and improve email deliverability Guide to reviewing SPF, DKIM, DMARC and PTR in cPanel, analysing a message with our email test and diagnosing why an email is rejected or ends up in spam. 8 min · Reviewed 10/2026 →
14. PHP mail(): what the result means and when to use SMTP Check what happens after mail(), set a valid sender and prepare SMTP with TLS without confusing local acceptance with delivery. 4 min · Reviewed 09/2026 →
15. Greylisting: why it can delay email Explains how greylisting holds back senders that do not retry delivery, why it can delay messages and where to turn it off for a domain. 3 min · Reviewed 09/2026 →
16. Add an external server to the SPF record from cPanel Authorise Google Workspace, Mailchimp or any other service that sends email on your behalf in your domain's SPF, from cPanel's Email Deliverability and without creating a second record. 6 min · Reviewed 10/2026 →
17. How to recognise email impersonation Describes the usual ways senders, names or conversations are faked to spread malware, and what to check before opening an attachment. 5 min · Reviewed 09/2026 →

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