Most aerospace and defense industry challenges eventually show up in your email program, usually as silence. Campaigns that would perform fine in ordinary B2B get filtered, ignored, or flagged here. A few specific problems cause most of the pain.
Compliance sits at the top because getting it wrong stops being a marketing problem and becomes a legal one. ITAR and EAR restrict who is allowed to see certain technical data, and that includes data sitting in an email attachment. CMMC layers cybersecurity requirements on anyone handling controlled unclassified information, so even your marketing stack can turn into an audit question.
Then there is the buying committee. A single deal can involve a procurement manager, two engineers, a quality director, and someone whose entire job is talking to the government. The engineer wants tolerances and cert numbers while the executive wants delivery risk, and one email genuinely cannot speak to both of them.
And the filters. Primes like Lockheed Martin, Boeing, and Airbus run some of the most aggressive email security anywhere. Link shorteners, image-heavy templates, and tracking pixels that sail through everywhere else will bury you in quarantine here without a bounce notice to warn you.
The fix for the filter problem is mostly discipline, not cleverness. Plain-text-leaning templates, a clean dedicated sending domain, no attachments on a first touch, and SPF, DKIM, and DMARC configured before anything goes out. None of that is exciting. All of it decides whether you exist in the inbox.