Delivery Center Plus: for complex senders and higher volume

Everything in Delivery Center, plus SPF Flattening and advanced threat investigation tools, with room for 5,000,000 messages and 100 Inbox Placement tests a month.

SPF FlatteningThreat investigation100 placement tests/mo5M messages

See your configuration and threats, improve delivery and protect your brand from spoofing.

Sign Up for Plus: $399/mo Compare All Plans
MxToolbox Delivery Center Plus

Is Plus right for you?

Choose Plus if you:

  • Have an SPF record at or near the 10-lookup limit
  • Send more than 500,000 messages
  • Test campaigns more than 30 times a month
  • Need to investigate who's spoofing your domain

Otherwise, Delivery Center ($129/mo) covers most teams and comes with a 30-day money-back guarantee.

Too many SPF lookups?

More than 10 DNS lookups in your SPF record makes SPF fail, and DMARC with it.

Check your SPF record free →

What Plus adds to Delivery Center

Plus raises your message volume from 500,000 to 5,000,000, includes 100 Inbox Placement tests a month instead of 30, and adds SPF Flattening and advanced threat investigation tools. Compare every plan below →

Built for complex email setups

SPF Flattening

Every vendor wants into your SPF record. Flattening automatically removes duplicate senders, consolidates overlapping IP ranges and builds a compliant record that covers all your verified senders, under the 10-lookup limit.

Learn about SPF Flattening →

Threat investigation

Spoofed mail can make up most of the email that claims to come from your domain, even for small businesses. See each source's IP ownership, geolocation and reputation, so you know who's sending as you.

Compliance, then enforcement

See SPF, DKIM and DMARC performance by sender and fix the failures. Compliance meets the bulk sender rules; enforcement is the goal that protects your brand, sending reputation and business from BEC.

Learn about DMARC enforcement →

Ongoing maintenance

New email providers and configuration changes happen all the time. Plus flags what changed and warns you about BIMI and feedback loop issues before they cost you delivery.

Sign Up for Plus

Built for the way your team sends

Email Marketers

Run 100 Inbox Placement tests a month across campaigns and ESPs, and keep every sending service inside SPF's limits.

DMARC Adopters

Investigate unknown senders, fix SPF bloat with flattening, and move from compliance to enforcement with confidence.

IT Email Administrators

Get higher volume limits and threat data to trace spoofing back to its source.

20+ years in email deliverability

42K+Domains trust MxToolbox
100+Blacklists checked
500+DMARC-reporting inbox providers
MillionsMessages processed hourly

Frequently asked questions

What is SPF Flattening?

SPF allows only 10 DNS lookups. Flattening replaces nested includes with the IP ranges they resolve to and keeps them updated, so your record stays valid as vendors change.

Does Plus have a money-back guarantee?

No. The 30-day money-back guarantee applies only to the Delivery Center plan.

What do the threat investigation tools show?

For each source sending as your domain: who owns the IP, where it is and its reputation, so you can tell legitimate senders from spoofers.

Need more than 5 domains?

Talk to us about Managed Services or a custom plan at +1 (866) 698-6652.

Rather have experts handle it? MxToolbox Managed Services takes care of inbox placement, blacklist monitoring, SPF/DKIM setup and DMARC enforcement for you. Learn about Managed Services →

Compare plans

Start free, or pick the plan that fits how you send.

Free$0One domain, top 30 blacklistsSign Up Delivery Center$129/monthManage your own email reputationBuy Now30-day money-back guarantee Delivery Center Plus$399/monthHigher volume, complex sendersBuy Now Managed ServicesCustom pricingOur experts do it for youSchedule a Consultation
Plan limits
Domains155Custom
Email message volume—500,0005,000,000Custom
Monitoring
Blacklist monitoringChecks your senders against public blacklists and alerts you when a new listing appears
Top 30 lists, weeklyEvery sender, 100+ listsEvery sender, 100+ listsEvery sender, 100+ lists
Adaptive Blacklist MonitoringFinds every service sending as your domain, including ESPs and CRMs, from your DMARC reports and adjusts automatically when their IPs change
—✓✓✓
Outbound + Inbound Mailflow MonitoringRound-trip test messages every 5 minutes, tracking queue delays and server response times, with alerts at your thresholds
—✓✓✓
Inbox Placement
Inbox Placement testsInbox, Spam/Junk or rejected at Google, Yahoo! and Outlook.com
—30 / month100 / month100 / month
Email visualizationYour full email rendered, with MxTips highlighting risky content
—✓✓✓
Content quality analysisWording, image counts, links and unsubscribe patterns that look like spam, with images verified and links tested before you send
—✓✓✓
Email header analysisSPF, DKIM and DMARC alignment checked on every test message
—✓✓✓
Bulk sender rule testsGoogle, Yahoo! and Microsoft requirements, updated as the rules change
—✓✓✓
Domain, IP & content reputationUncover the proprietary blocklist and reputation issues behind spam placement
—✓✓✓
Recipient complaints
Google Postmaster spam rateTrack your Gmail spam rate against Google's 0.1% target and 0.3% limit
—✓✓✓
Feedback loops (ARF)Complaint reports from Yahoo!, Outlook.com, Mailgun and others
—✓✓✓
Complaint analysisSee who is complaining, clean your lists and audit campaign quality
—✓✓✓
DMARC reporting
RUA aggregate reportsDaily reports from Google, Outlook.com, Yahoo! and 500+ inbox providers, parsed for you
—✓✓✓
Sender discoveryFind the legitimate, unknown and unauthorized senders using your domain
—✓✓✓
RUF forensic reportsIndividual messages that failed authentication, turned into actionable reports
—✓✓✓
SPF & DKIM alignment trackingPass and alignment rates by sender and DKIM selector
—✓✓✓
Configuration & protection
SPF, DKIM & DMARC configuration managementExpert recommendations and tools to set up SPF, DKIM and DMARC and keep them current as your senders change
—✓✓✓
DMARC enforcement (Domain Impersonation Protection)Move safely from p=none to quarantine and reject to block spoofing and BEC without blocking your own mail
—✓✓✓
BIMI Adoption and ManagementValidates your BIMI record, SVG logo and VMC or CMC certificate, and alerts you before a certificate expires
—✓✓✓
SPF FlatteningKeeps your SPF record under the 10-lookup limit and rebuilds it as you add senders
——✓✓
Advanced threat toolsSee the IP ownership, geolocation and reputation of unknown senders to trace who is spoofing your domain
——✓✓
Expert service
Onboarding support & account walkthrough—✓✓✓
Email setup assessment of every internal and 3rd-party sender———✓
Hands-on SPF, DKIM and DMARC implementation———✓
Expert analysis of your DMARC report data———✓
Proactive monitoring, alerts and recommendations———✓
Ongoing maintenance as senders and requirements change———✓
Team education & DMARC compliance training———✓
Free$0Sign UpDelivery Center$129/monthBuy NowDelivery Center Plus$399/monthBuy NowManaged ServicesCustom pricingSchedule a Consultation
Plans & pricing30-day money-back guarantee on Delivery CenterCompare all features
Free$0Sign Up
Delivery Center$129/moBuy Now
Delivery Center PlusDC Plus$399/moBuy Now
Managed ServicesManagedCustomSchedule a ConsultationContact Us

Email delivery for complex senders

SPF Flattening, threat investigation and room to grow, on top of everything in Delivery Center.

Sign Up for Plus: $399/mo Learn about Managed Services

Questions? Call us at +1 (866) 698-6652.