# How can we help?

## Search

- [Why was a contact given an unsubscribed status?](https://support.cordial.com/hc/en-us/articles/115002492212-Why-was-a-contact-given-an-unsubscribed-status)
- [Blacklists](https://support.cordial.com/hc/en-us/articles/360034569671-Blacklists)
- [Create a custom subscriber preferences form](https://support.cordial.com/hc/en-us/articles/360016576952-Create-a-custom-subscriber-preferences-form)
- [Create an internal suppression list](https://support.cordial.com/hc/en-us/articles/360006891372-Create-an-internal-suppression-list)
- [Email bounce codes](https://support.cordial.com/hc/en-us/articles/34376010577677-Email-bounce-codes)
- [Cordial DNS Records: DNS overview](https://support.cordial.com/hc/en-us/articles/6131362291597-Cordial-DNS-Records-DNS-overview)
- [Cordial DNS Records: BIMI](https://support.cordial.com/hc/en-us/articles/360043582112-Cordial-DNS-Records-BIMI)
- [Cordial DNS Records: DKIM](https://support.cordial.com/hc/en-us/articles/360044032111-Cordial-DNS-Records-DKIM)
- [Cordial DNS Records: DMARC](https://support.cordial.com/hc/en-us/articles/360044047111-Cordial-DNS-Records-DMARC)
- [Cordial DNS Records: SPF](https://support.cordial.com/hc/en-us/articles/360043598412-Cordial-DNS-Records-SPF)
- [Data validation/hygiene vendors and tips](https://support.cordial.com/hc/en-us/articles/360001264452-Data-validation-hygiene-vendors-and-tips)
- [Email sending subdomains](https://support.cordial.com/hc/en-us/articles/115002191992-Email-sending-subdomains)
- [Gmail & deliverability](https://support.cordial.com/hc/en-us/articles/360004587251-Gmail-deliverability)
- [Outlook receiver profile](https://support.cordial.com/hc/en-us/articles/360034202012-Outlook-receiver-profile)
- [Reputation: what it is and why it matters](https://support.cordial.com/hc/en-us/articles/360001317672-Reputation-what-it-is-and-why-it-matters)
- [Spam traps](https://support.cordial.com/hc/en-us/articles/115008711908-Spam-traps)
- [The migration ramp-up process: why we ramp IPs/domains](https://support.cordial.com/hc/en-us/articles/360001337471-The-migration-ramp-up-process-why-we-ramp-IPs-domains)
- [Deliverability spam laws, industry emails, and blogs](https://support.cordial.com/hc/en-us/articles/360044075651-Deliverability-spam-laws-industry-emails-and-blogs)
- [When is a contact's email flagged as invalid?](https://support.cordial.com/hc/en-us/articles/217421247-When-is-a-contact-s-email-flagged-as-invalid)
- [How do I move an existing “from” domain to Cordial?](https://support.cordial.com/hc/en-us/articles/360044047931-How-do-I-move-an-existing-from-domain-to-Cordial)
- [What factors could contribute to message delivery delays?](https://support.cordial.com/hc/en-us/articles/360044053531-What-factors-could-contribute-to-message-delivery-delays)
- [Do hard bounces get marked as unsubscribed?](https://support.cordial.com/hc/en-us/articles/217421837-Do-hard-bounces-get-marked-as-unsubscribed)
- [Why are special characters not rendering in emails?](https://support.cordial.com/hc/en-us/articles/115003793132-Why-are-special-characters-not-rendering-in-emails)