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 DMARC and review your domain's policy Publish a single DMARC TXT record, start by monitoring your senders and check alignment before requesting quarantine or rejection. 5 min · Reviewed 10/2026 →
7. Improve SpamAssassin antispam classification Shows how to improve SpamAssassin by marking hits and mistakes from webmail, and how to create whitelists or blacklists for specific senders and domains. 3 min · Reviewed 09/2026 →
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 Explains how to turn on SpamAssassin, send detected mail to a folder or delete it, adjust the threshold and correct false positives from Roundcube. 4 min · Reviewed 09/2026 →
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. Manage SPF records Shows how to authorise in SPF the external servers that send on behalf of a domain, using the Email Deliverability customisation in cPanel. 4 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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