You'll be able to see if you're using our legacy mailer system by heading to Settings › Mail Settings. Any emails going through the legacy mailer will show a warning here:

If you are using our legacy mailer, we would recommend updating to a Gmail integration, Outlook or custom SMTP server. The legacy mailer may now cause deliverability issues due to recent update in Google, Yahoo and others.

Adding an SPF record to your website host helps with deliverability on messages sent from Táve.  Email providers look at this record to help determine the likelihood of a particular message being genuine or not.

If your mail isn’t getting delivered at all, not even to the spam box, chances are you already have an SPF record and it doesn’t include Táve.

An SPF record is simply a DNS record of the TXT type. Your hosting provider can usually add this record for you, but most have interfaces which make this pretty easy to do yourself.  See some links below to SPF record tutorials provided by some popular hosting providers.
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If you already have an SPF record published, you would just add:

If you send email from your website, your ISP, and Táve, then this is likely an acceptable TXT record for you:

Be aware that it may take a day for your changes to be processed by most mail servers.
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You can verify your SPF record is valid by using this form and entering the IP address 50.31.39.46 and one of the email addresses on your domain.

For initial testing, you should set the TTL pretty low (3600 seconds or 1 hour), so that you can make changes without having to wait a long time for your DNS cache to expire. Once you have verified your changes and everything appears to be working, you can then increase the TTL.