Why SendX emails land in spam and how to fix it

SendX email deliverability problems almost always come from one of three places: missing or misaligned authentication, a shared sending reputation you don't fully control, or a list that was never warmed before volume ramped up. None of these are SendX-specific bugs - they are the same root causes behind most "my emails aren't arriving" tickets, just dressed in SendX's dashboard.

Start with authentication, not the campaign report

Before touching subject lines or send times, confirm the domain sending your SendX campaigns has a correctly published SPF record that includes SendX's sending hosts, a DKIM key that is active (not just generated), and a DMARC record with a policy stronger than p=none. SendX's own onboarding screen shows the exact CNAME or TXT values to publish for DKIM and the return-path subdomain for your account - copy those values directly from your SendX settings page rather than trusting a value you remember or find in an old support thread, because these hostnames and selectors are account-specific and SendX can rotate them.

Check propagation with a plain DNS lookup rather than relying on SendX's internal "verified" badge alone:

dig TXT yourdomain.com +short
dig TXT _dmarc.yourdomain.com +short
dig CNAME sendx._domainkey.yourdomain.com +short

If any of these come back empty, the record has not propagated or was entered with a typo (trailing dot, wrong subdomain, or a duplicate SPF line - a domain can only have one SPF TXT record, and two will break alignment entirely).

Shared IP pools mean you inherit other senders' reputation

SendX, like most mid-market ESPs, sends a large share of its customer volume from shared IP pools. That is not inherently bad - a well-managed shared pool with tight sender vetting can deliver fine - but it means your inbox placement is partly determined by senders you have never met. If your placement suddenly drops without any change on your end, a neighbour on the same pool getting blocklisted is a plausible cause, and there is little you can do except monitor and, if it persists, ask about a dedicated IP option if SendX offers one on your plan.

The deliverability metrics SendX shows you are not the whole picture

Open rate, click rate, and bounce rate are the numbers most ESP dashboards surface, and they systematically overstate how well you are doing. Apple Mail Privacy Protection pre-fetches images for a large share of iOS and macOS recipients, which inflates open rate regardless of whether a human read the email. Soft bounces get retried silently. None of this tells you whether a delivered message landed in the inbox, Gmail's Promotions tab, or spam.

Real inbox placement requires sending to a panel of seed addresses across Gmail, Outlook, and Yahoo and checking where each copy actually lands - something the campaign-level report in most ESPs, SendX included, does not do.

List hygiene is the lever most people skip

A list with stale addresses, role accounts (info@, support@), or purchased contacts will suppress your deliverability no matter how clean your authentication is. Before a volume increase:

1. Remove hard bounces immediately and permanently - never resend to them.
2. Re-permission or suppress contacts that haven't opened or clicked in 90-180 days.
3. Strip role-based and disposable addresses from any imported list.
4. Never import a list you did not build through confirmed opt-in.

New sending domain or mailbox? Warm it before you need it

If you are standing up a new sending domain for SendX campaigns, or moving to a new subdomain to isolate marketing mail from transactional mail, send volume needs to ramp gradually - a handful of messages a day for the first week, increasing over two to four weeks - so mailbox providers build a reputation signal before they see your real volume. Jumping straight to full-list sends on a brand-new domain is the single most common cause of a new domain going straight to spam.

Where MailPilot fits

MailPilot does not integrate with SendX - it connects to mailboxes over OAuth (Gmail, Outlook) or SMTP/IMAP (SendGrid, Amazon SES, Mailgun, Postmark, custom SMTP), and that is the full list. If your SendX sending domain or a related mailbox is reachable over one of those paths, MailPilot can warm it before you ramp volume, run SPF/DKIM/DMARC checks against the live DNS record rather than a dashboard badge, and show daily per-mailbox reputation and real inbox placement across providers - the layer SendX's own analytics does not provide.