True cost comparison — not just what the pricing page says
Quick Verdict
SendGrid saves you 100%
Best for SendGrid
Microsoft's business productivity suite (Outlook, Teams, Office apps). Per-user pricing where deskto
Best for Microsoft 365
Twilio's email delivery platform for transactional and marketing emails. Free for 100 emails/day, th
Twilio's email delivery platform for transactional and marketing emails. Free fo...
Advertised
$0
/month
True Cost
$105
/month (typical)
Dedicated IP Required for Deliverability
Shared IP on lower plans hurts deliverability. Dedicated IP costs $20-$40/mo extra and requires Pro ...
Email Validation Add-On
Email address validation to reduce bounces costs $0.003-$0.01 per validation. Validating a 50K list ...
Overage Email Charges
Exceeding monthly email limit incurs overage at $0.00085-$0.001 per email. 100K extra emails = $85-$...
Microsoft's business productivity suite (Outlook, Teams, Office apps). Per-user ...
Advertised
$6
/month
True Cost
$114
/month (typical)
Desktop Apps Require Business Standard
Business Basic ($6/user/mo) only includes web and mobile Office apps. Desktop Word, Excel, PowerPoin...
Copilot AI Add-On
Microsoft 365 Copilot AI is $30/user/mo — separate from all base plans. For 50 users, Copilot alone ...
Compliance Features Require E5
Advanced compliance (eDiscovery, DLP, Information Barriers, Insider Risk Management) require Enterpr...
Teams Phone Add-On
Microsoft Teams Phone System for PSTN calling is not included in any standard plan. Teams Phone Stan...
Microsoft 365 advertises $6/mo. SendGrid advertises $0/mo.
Microsoft 365 has 4 documented hidden fees. SendGrid has 3.
Microsoft 365 confidence: 84%. SendGrid confidence: 75%.
| Metric | SendGrid | Microsoft 365 | Winner |
|---|---|---|---|
| Advertised Price | $0/mo | $6/mo | SendGrid |
| True Monthly Cost | $105/mo | $114/mo | SendGrid |
| Hidden Fee Total | +$105/mo | +$107.5/mo | SendGrid |
| # Hidden Fees | 3 | 4 | SendGrid |
| Confidence Score | 75% | 84% | Microsoft 365 |
| Pricing Tiers | 3 | 3 | — |
| Affiliate Program | None | No public affiliate program | — |
SendGrid advertises $0/mo and Microsoft 365 advertises $6/mo. However, when you include hidden fees, SendGrid has 3 documented hidden fees adding +$105/mo, while Microsoft 365 has 4 hidden fees adding +$107.5/mo. Based on true cost, SendGrid is typically 100% cheaper.
SendGrid has 3 documented hidden fees: Dedicated IP Required for Deliverability, Email Validation Add-On, Overage Email Charges. These add approximately +$105/mo on top of the $0/mo advertised price.
Microsoft 365 has 4 documented hidden fees: Desktop Apps Require Business Standard, Copilot AI Add-On, Compliance Features Require E5, Teams Phone Add-On. These add approximately +$107.5/mo on top of the $6/mo advertised price.
Choose SendGrid if: Microsoft's business productivity suite (Outlook, Teams, Office apps). Per-user pricing where deskto. Choose Microsoft 365 if: Twilio's email delivery platform for transactional and marketing emails. Free for 100 emails/day, th. The right choice depends on your team size, usage volume, and which features you need most.
This comparison is based on manual research of official pricing pages, terms of service, and user reports. SendGrid data has a 75% confidence score and Microsoft 365 has 84%. Prices were last verified in April 2026. For the most accurate estimate, enter your specific usage in our calculator.
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