# DKIM record for SMTP2GO URL: https://iblockspam.com/dkim/smtp2go Last updated: 2026-10-22 Record type: CNAME Selectors: shown in SMTP2GO for your domain Key managed by: Provider (CNAME delegation) SMTP2GO handles DKIM through the second of the three CNAME records you add when you verify a sender domain. It points a `_domainkey` name on your domain to `dkim.smtp2go.net`, where SMTP2GO keeps the key. The other two CNAMEs are the return path (for SPF) and the link-tracking domain. Copy the exact host names from your dashboard. ## DNS records - DKIM (CNAME, host ._domainkey): `dkim.smtp2go.net` - Return path (SPF) (CNAME, host em12345): `return.smtp2go.net` `em12345` is SMTP2GO's example. Point it at `return-alt.smtp2go.net` instead if you need an SPF hard fail (`-all`). - Link tracking (CNAME, host link): `track.smtp2go.net` Not part of authentication: once verified, SMTP2GO requests a certificate so tracked links use https. ## Set it up and turn on signing - In the SMTP2GO dashboard, open **Sending > Verified Senders > Sender domains**, click **Add sender domain** and enter the domain (for `hello@exampledomain.com`, enter `exampledomain.com`). - Pick manual or automatic setup. The automatic option logs in to your DNS host through Entri; SMTP2GO says it doesn't store those login details. - For manual setup, create the three CNAMEs with the host names and values the page lists. SMTP2GO recommends a TTL of 14400 seconds. - At Cloudflare, set the records to DNS only and disable CNAME flattening, then click **Verify**. The domain works once its status reads Verified. - If it doesn't verify, check the CNAMEs on each of your authoritative DNS servers, or hover over the warning symbol on the Verified Senders page for the error. ## DMARC alignment With a verified sender domain, SMTP2GO signs with your domain. Without one, for example when you verify only a single sender address, it signs with its own DKIM signature and Gmail can show the mail as "via smtpcorp.com" or "via smtp2go.com". Single sender emails don't use your domain for SPF either, so they can't align for DMARC. Subdomains can send once the top-level domain is verified, provided they exist in your DNS. ## Key length and rotation The key sits behind `dkim.smtp2go.net`, a name SMTP2GO controls, so it can change the key without you touching DNS. SMTP2GO doesn't publish a key length or rotation schedule. Agencies can add their own CNAMEs pointing to `dkim.smtp2go.net` and give clients those names instead, as SMTP2GO's FAQ describes for return, DKIM and tracking records. ## Common mistakes - **A DNS host that rejects underscores.** The DKIM name needs one; SMTP2GO says to ask your host to add it manually. - **Cloudflare proxying or CNAME flattening.** Both stop the records from verifying. - **Your domain appended to the value.** Some hosts add it automatically; SMTP2GO's DNS guides say a trailing dot, as in `dkim.smtp2go.net.`, stops that. - **Relying on a single sender address.** Mail then carries SMTP2GO's signature, not yours. **Q: What does the SMTP2GO DKIM CNAME point to?** `dkim.smtp2go.net`. The host name on your domain is generated per account and shown on the Sender domains page, so copy it from there. It is the second of the three CNAMEs SMTP2GO asks for. **Q: Why does Gmail show my SMTP2GO mail as via smtpcorp.com?** Because the domain isn't verified, so SMTP2GO signs with its own domain. That happens when you verify a single sender email instead of the domain. Verify the sender domain and add its CNAMEs to sign with your own. **Q: Can I use TXT records instead of CNAMEs with SMTP2GO?** Only on request. SMTP2GO says that if your business has a policy against CNAME records, it can enable TXT and MX records instead. Sources: - SMTP2GO Support: Verified Senders: https://support.smtp2go.com/hc/en-gb/articles/115004408567-Verified-Senders - SMTP2GO Support: SPF, DKIM and DMARC overview: https://support.smtp2go.com/hc/en-gb/articles/28543815517209-SPF-DKIM-and-DMARC-Overview - SMTP2GO Support: DNS setup for Cloudflare: https://support.smtp2go.com/hc/en-gb/articles/360022578154-DNS-Setup-for-Cloudflare - SMTP2GO Support: DNS setup for DNS Made Easy: https://support.smtp2go.com/hc/en-gb/articles/360022578534-DNS-Setup-for-DNS-Made-Easy --- Source: iBlockSpam, https://iblockspam.com/dkim/smtp2go (this is a Markdown copy; the HTML page is canonical). Quote with attribution and a link. Site index for AI assistants: https://iblockspam.com/llms.txt