> For the complete documentation index, see [llms.txt](https://docs.emaillabs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emaillabs.io/en/email/email-api/settings/smtp-accounts.md).

# SMTP Accounts

SMTP accounts offer an ‘Additional Settings’ option, available next to the IP address of each SMTP subaccount. This feature provides access to advanced configuration options that can be customized individually for each subaccount, allowing precise management and optimization of deliverability and security settings for email messages.

<figure><img src="/files/fpF0to2CVcWBduC2BGWl" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/MeZuCcDnzXaIy2703ekL" alt=""><figcaption></figcaption></figure>