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Domains & Authentication

Strato

Publish the SPF, DKIM, and DMARC records MailBlastr generates for your domain on Strato — including creating the send subdomain to host the MX record.

This guide walks through adding the DNS records MailBlastr generates for a domain using Strato. Add your domain in MailBlastr first to generate the records — see Managing domains — and keep the DNS records reference open for your exact DKIM record and region.

It is best practice to use a subdomain (e.g. updates.example.com) instead of the root domain for reputation segmentation.

By default Strato domains use the Strato mail server (the mail send path). To host MailBlastr’s MAIL FROM MX you must create a `send` subdomain and set the MX record there, bypassing the default.

Log in to Strato

  1. 1
    Open Domain Manager

    Log in to your Strato account and, in the left-hand navigation, go to Domains → Manage Domain.

  2. 2
    Open settings

    Click the gear icon on the domain to open its Settings, where the DNS records live.

  3. 3
    Add each record

    Add every entry below — the DKIM TXT record, the SPF MX (on a send subdomain) and TXT, and the DMARC TXT.

DKIM — TXT

On the base domain’s DNS tab, manage the TXT records and add one TXT record holding your domain’s DKIM public key. DKIM values are case-sensitive and must match exactly; copy the value with the copy icon in MailBlastr.

DKIM — TXT
TypeTXToptional

A single DKIM key record.

Namemailblastr._domainkeyoptional

Resolves to mailblastr._domainkey.example.com. mailblastr is the fixed selector MailBlastr uses.

Valuev=DKIM1; k=rsa; p=<public key>optional

The DKIM key record holding your domain’s public key. Must match exactly — DKIM is case-sensitive.

SPF — MX on the send subdomain

Create a new subdomain named send, open its settings, go to the DNS tab, and manage its MX record. Select own mail server, paste the MailBlastr MX value into the Server field, and use the default priority Low.

SPF — MX
TypeMXoptional

Receives bounce and complaint feedback for the MAIL FROM subdomain.

Namesendoptional

The send.example.com subdomain you created.

Mail serverfeedback-smtp.us-east-1.amazonses.com.optional

Region-specific feedback host (keep the trailing dot). Replace us-east-1 with your domain’s region.

PriorityLowoptional

Strato’s default priority setting for an own mail server.

SPF — TXT on the send subdomain

On the base domain settings, go to the DNS tab, manage TXT/CNAME records, and click Create another record. Choose TXT, set Name to send, and enter the SPF value.

SPF — TXT
TypeTXToptional

SPF policy for the MAIL FROM subdomain.

Namesendoptional

Resolves to send.example.com.

Valuev=spf1 include:amazonses.com ~alloptional

Authorizes Amazon SES for the MAIL FROM subdomain.

DMARC — TXT on _dmarc

Strato may provide a standard DMARC record (e.g. v=DMARC1; p=reject;). MailBlastr recommends starting at p=none; to monitor first, then tightening — see Implementing DMARC.

DMARC — TXT
TypeTXToptional

DMARC policy record.

Name_dmarcoptional

Resolves to _dmarc.example.com.

Valuev=DMARC1; p=none;optional

A monitoring policy to start with; tighten to quarantine or reject later.

Strato gotchas: you must create the send subdomain to host the MAIL FROM MX (the default mail path won’t work); DKIM values are case-sensitive — copy them exactly; and keep the trailing dot on the MX value.

Once all six records are saved, return to MailBlastr and re-verify the domain. If it stays pending, see What if my domain isn’t verifying?.