Deliverability & Reliability
Reliable email delivery for SaaS and AI teams
Your product emails need to arrive when users are waiting for them. Sidemail helps SaaS and AI teams send, manage, monitor, and improve email delivery from one simple platform.
Over 8 years
On the market serving product teams
EU‑based team
Independent and privacy focused
Millions of emails
Delivered for SaaS and AI products
GDPR compliant
Your data are processed responsibly
5‑star rated support
Real people who understand email
Sidemail reliability at glance
Metrics window: Last 90 days
Last updated: [Month Day, Year, Time]
Status page: https://status.sidemail.io/
Checking system status
| Sidemail Public uptime | [99.XX%] |
| Sidemail Client uptime | [99.XX%] |
| Sidemail API uptime | [99.XX%] |
| Emails delivered by Sidemail | Millions+ |
| Email history retained | 90 days |
| Sender authentication | Domain verification, SPF, DKIM, DMARC |
| Email statuses tracked | Queued, delivered, open, bounce, complain, error, suppressed, scheduled |
| SLA | Service Level Agreement available |
| Support | Human support included |
How Sidemail protects your deliverability
Deliverability is not a single feature. It’s a system. Here’s how we protect your email every day.
Authenticated sending from your domain
Sidemail helps you verify your sending domain and provides you with DKIM, SPF, and DMARC setup so inbox providers can recognize your emails as legitimate and trusted.Carefully managed sending infrastructure
Sidemail handles the infrastructure layer for you, ensuring the email delivery is fast, stable, and reliable.Handling bounces & complaints
Bounces and complaints are processed automatically, with recipients added to a suppression list to protect your sender reputation and delivery quality.Giving you the full visibility
Sidemail provides you with detailed API logs, email statuses, events, and 90‑day full message history, giving you deep visibility into every email.Service Level Agreement
Sidemail’s SLA backs your email infrastructure with a clear availability commitment, so critical product emails are supported by more than a promise.Providing expert support
Email experts (real humans) are here to help whenever you have questions or need help, including domain setup, delivery troubleshooting, and integration guidance.
Designed to be simple, but not shallow
Sidemail is intentionally simpler than traditional enterprise email clouds, but it still covers the core delivery workflow product teams need.
You get:
- Email sending API
- SMTP relay
- Dynamic templates
- Markdown emails
- Custom HTML emails
- Plain text emails
- File attachments
- Scheduled delivery
- Email automation
- Newsletters
- Contact profiles
- Subscribe forms
- Email event history
- Webhooks
- MCP server for AI‑assisted workflows
- Service Level Agreement (SLA)
- Human support
Use cases
Built for product‑critical emails
Sidemail is designed for SaaS and AI teams that send both transactional and product emails.
- Password reset emails
- Magic links and login codes
- Welcome and onboarding emails
- Trial and lifecycle emails
- Billing and invoice notifications
- Product updates and newsletters
- Account alerts and system notifications
- Customer education sequences
- Subscriber and contact management
- Subscribe forms and email automation
Authenticated sending from your own domain
Domain verification helps prove that you control the domain you want to send from. DKIM helps receiving mail servers verify that your emails were authorized by your domain and were not altered in transit.
Sidemail provides you with best practices out‑of‑the‑box and guides you through the DNS setup. For Cloudflare users, Sidemail can configure DNS records through a direct integration, reducing manual setup work.
Recommended setup:
- Verify your sending domain + setup DKIM and SPF
- Publish a DMARC record
- Keep reply‑to addresses valid and monitored
- If needed use separate subdomains for different email streams
Built‑in bounce, complaint, and suppression handling
Bad addresses and unwanted email hurt deliverability. Sidemail tracks email outcomes and helps you understand what happened to each message.
When an email bounces, receives a complaint, or should no longer be sent to, Sidemail helps prevent repeated sending that could damage reputation.
Email statuses include:
- queued
- delivered
- open
- bounce
- complain
- suppressed
- error
- scheduled
Email history & detailed API logs
When a customer says “I didn’t receive the email” you need answers quickly. Sidemail gives you 90‑day email history and detailed API logs so you can inspect recent delivery activity, search messages, and see detailed information.
You can use Sidemail to check:
- Whether the email was created
- When it was queued
- Which address it was sent to
- Whether it was delivered
- Whether it bounced or was suppressed
- Whether there was a complaint
- Related event history and more
This makes support easier for your team and less frustrating for your users.
Recommended practises to further improve your deliverability
Sidemail gives you the infrastructure, tools, and visibility to send reliably, but strong deliverability also depends on how you send. These sending practices help you strengthen it even further.
- Send only to people with a real relationship to your company
- Make unsubscribe easy for marketing emails – Sidemail handles that for you
- Keep sender reputation healthy – Always visible in your Sidemail Overview + in case of any issues we provide you with actionable tips and steps to do
- Remove invalid or inactive addresses – Sidemail provides you with built‑in email list cleaner
- Use clear sender names
- Keep transactional and promotional intent clear
- Avoid sudden volume spikes from new domains
- Monitor bounces and complaints – Easily in your Sidemail Dashboard
FAQs
Can Sidemail guarantee inbox placement?
No email platform can honestly guarantee that every message will land in the inbox. Inbox providers evaluate many signals, including your authentication, reputation, recipient engagement, complaint rate, content, and sending behavior. Sidemail gives your email strong technical and operational foundation, monitors platform health, helps prevent harmful sending, and gives you visibility into delivery events.
Does Sidemail support DKIM?
Yes. When setting up your sending domain in Sidemail, we provide you with DNS records to add to your domain's DNS provider and automatically set up DKIM and SPF for you so you can send authenticated email from your own domain. Also, for Cloudflare users, Sidemail can configure DNS records through a direct integration, reducing all manual setup work.
Do I need DMARC too?
For best results, yes. DKIM and SPF are important, but DMARC helps further protect your domain from spoofing/phishing and improves email deliverability. Modern inbox providers also expect proper DMARC configuration, especially for higher‑volume senders. To enable DMARC for your domain, Sidemail provides your with a DNS record you can simply add in your DNS provider.
Does Sidemail handle bounces and complaints?
Yes, Sidemail tracks bounce and complaint statuses and helps protect sending reputation through suppression and monitoring.
How long can I inspect email history?
Sidemail provides a 90‑day full email history.
Is Sidemail only for transactional emails?
No. Sidemail supports transactional emails, marketing emails, product updates, newsletters, automation, contact profiles, and subscribe forms.
Does Sidemail offer SMTP?
Yes. Sidemail supports SMTP relay as well as API sending.
Is Sidemail good for SaaS onboarding emails?
Yes. Sidemail is built for SaaS workflows such as welcome emails, onboarding sequences, trial emails, product updates, billing notifications, and lifecycle automation.
Is Sidemail good for cold outreach?
No. Sidemail is not intended for spam, scraped lists, purchased lists, or cold outreach operations.
Is Sidemail GDPR‑compliant?
Yes, Sidemail is GDPR‑compliant. You can review Data Processing Agreement here.
What happens during a service incident?
Sidemail communicates platform status through its public API status page. During incidents, customers can see what is affected, when the incident started, and when service returns to normal. You can visit the status page here.
Does Sidemail have an SLA?
Yes. Sidemail provides a Service Level Agreement (SLA) that defines uptime commitments and compensations. You can review it here.
Why choose Sidemail instead of a low‑level provider?
Low‑level email services can be cost‑effective at scale, but they usually require more engineering work around templates, logs, automations, contacts, suppression, troubleshooting, and support. Sidemail is for teams that want email delivery and email management in one platform.
Reliable email delivery starts here
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