Sabahattin Kalkan

Systems Engineer & Software Architect from Baku. I build developer tools and software for real-world engineering problems. Currently validating Recall — persistent repository context for coding agents.

Products

MailTest
Email deliverability debugger that runs 11 technical checks — SPF, DKIM, DMARC, blacklists, SpamAssassin, rDNS, and more. Shows exactly WHY your emails land in spam with actionable fix instructions. Self-hosted via Docker Compose.
$0/mo (just launched)

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Recent activity

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.

I spent two years building things nobody used. This time I'm stopping at v0.2.0.