What Is Emailing? The Complete Guide to Professional Email

What Is Email?

Email (electronic mail) is a method of sending digital messages between people over the internet. Unlike instant messaging or social media, email is asynchronous — the recipient doesn't need to be online when you send it.

Key characteristics of email:

• Store and forward — messages are stored on servers until the recipient reads them
• Universal — works across all platforms, devices, and providers
• Professional standard — the default communication channel for business
• Documented — creates a written record of conversations

How Email Works (Simplified)

1. You write an email in your email client (Gmail, Outlook, etc.)
2. Your email client sends it to your outgoing mail server (SMTP)
3. Your server looks up the recipient's mail server (via DNS/MX records)
4. The recipient's server receives and stores the message
5. The recipient's email client downloads the message (via IMAP or POP3)

This entire process typically takes 1-5 seconds.

Anatomy of an Email

Every professional email has these components:

From

Your email address and display name. This is the first thing recipients see and it impacts whether they open or delete your email.

To

The primary recipient(s). These are the people who need to take action.

CC (Carbon Copy)

People who should be aware of the email but aren't the primary audience. Everyone can see who's CC'd.

BCC (Blind Carbon Copy)

Hidden recipients. Other recipients can't see who's BCC'd. Used for privacy or large group emails.

Subject Line

A brief description of the email's purpose. This is the most important line — it determines whether your email gets opened.

Body

The main content of your email. This is where your message lives.

Signature

Your closing — name, title, company, contact info. Usually automated.

Attachments

Files sent along with the email (documents, images, PDFs). Most providers limit attachments to 25MB.

Types of Email

1. Personal Email

Communication between friends and family. Informal tone, no structure requirements.

Providers: Gmail, Yahoo Mail, Outlook.com, iCloud Mail

2. Business Email

Professional communication within and between organizations. Uses a company domain (name@company.com).

Providers: Google Workspace, Microsoft 365, Zoho Mail

3. Transactional Email

Automated emails triggered by user actions — order confirmations, password resets, shipping notifications.

Sent via: SendGrid, Postmark, Amazon SES, Mailgun

4. Marketing Email

Newsletters, promotions, product announcements sent to subscriber lists.

Sent via: Mailchimp, ConvertKit, HubSpot, ActiveCampaign

5. Cold Email

Unsolicited outreach to prospects who haven't opted in. Used for sales, partnerships, recruiting, and link building.

Sent via: Dedicated cold email infrastructure (separate from marketing)

How to Write a Professional Email

Subject Line Best Practices

• Keep it under 60 characters (mobile truncates at ~35)
• Be specific — "Q2 Budget Approval Needed by Friday" beats "Quick question"
• Don't use ALL CAPS or excessive punctuation
• Include the action needed when possible

Opening Line

Skip "I hope this email finds you well." It's filler. Get to the point.

Good openers:

• "Following up on our call yesterday — here's the summary."
• "Quick question about the Q2 timeline."
• "Sharing the report you requested."

Body Structure

• One topic per email — multiple topics get multiple emails
• Short paragraphs — 2-3 sentences max
• Use bullet points for lists or multiple items
• Bold key information the reader needs to find quickly
• Front-load the important stuff — don't bury the ask in paragraph four

Closing Line

End with a clear call to action or next step.

Strong closings:

• "Can you confirm by Thursday?"
• "Let me know which option you prefer."
• "I'll proceed with Plan A unless I hear otherwise by EOD."

Professional Email Template

Subject: [Specific topic] — [Action needed if any]

Hi [Name],

[1-2 sentences: context/reason for the email]

[Details, organized with bullets or short paragraphs]

[Clear closing line with CTA and timeline]

Best,
[Your name]

Email Etiquette Rules

Do

• Reply within 24 hours (even if just to acknowledge receipt)
• Use Reply vs Reply All intentionally — don't spam 20 people with "Thanks!"
• Proofread before sending — especially recipient names and attachments
• Use a professional email address — firstname@company.com, not partyanimal99@gmail.com
• Keep it concise — respect the reader's time

Don't

• Don't use ALL CAPS — it reads as shouting
• Don't mark everything as "urgent" — the boy who cried wolf effect
• Don't CC someone's boss to pressure them — passive-aggressive and burns bridges
• Don't send emails you wouldn't want forwarded — assume anything can be shared
• Don't use "reply all" unless everyone needs the information

Email Protocols: SMTP, IMAP, POP3

SMTP (Simple Mail Transfer Protocol)

• Purpose: Sending email
• How it works: Transfers your email from your client to the mail server, and between servers
• Port: 587 (submission), 465 (SSL), 25 (server-to-server)

IMAP (Internet Message Access Protocol)

• Purpose: Reading email (recommended)
• How it works: Syncs email across all your devices. Messages stay on the server.
• Port: 993 (SSL), 143 (non-SSL)
• Best for: Anyone using email on multiple devices

POP3 (Post Office Protocol)

• Purpose: Reading email (legacy)
• How it works: Downloads email to one device, optionally deletes from server
• Port: 995 (SSL), 110 (non-SSL)
• Best for: Single-device users who want local copies

Which should you use? IMAP. Unless you have a very specific reason to use POP3, IMAP's multi-device sync is what modern email requires.

Email Security

SPF (Sender Policy Framework)

A DNS record that specifies which servers are authorized to send email for your domain. Prevents spoofing.

DKIM (DomainKeys Identified Mail)

A digital signature added to outgoing emails that proves the message wasn't altered in transit.

DMARC (Domain-based Message Authentication)

A policy that tells receiving servers what to do when SPF or DKIM checks fail (reject, quarantine, or allow). Also provides reporting.

Why This Matters

Without SPF, DKIM, and DMARC:

• Anyone can send emails pretending to be from your domain
• Your legitimate emails are more likely to land in spam
• You have no visibility into email authentication failures

Additional Security Measures

• Two-factor authentication (2FA) on all email accounts
• Encrypted connections (TLS) — verify your email client uses SSL/TLS
• Phishing awareness — never click links in suspicious emails
• Password hygiene — unique, strong passwords for email accounts

Email for Business: Setting Up Properly

Custom Domain Email

Professional email uses your company domain: mo@yourcompany.com

Options:

• Google Workspace ($6-18/user/month) — Gmail interface, Google Drive, Google Meet
• Microsoft 365 ($6-22/user/month) — Outlook, OneDrive, Teams
• Zoho Mail ($1-4/user/month) — budget-friendly, solid features

Setting Up DNS Records

1. MX Records — point your domain's email to the right servers
2. SPF Record — authorize your email servers
3. DKIM Record — add your signing key
4. DMARC Record — set your authentication policy

Your email provider will give you the exact records to add in your domain's DNS settings.

Cold Email: Using Email for Outreach

Cold email is sending unsolicited emails to prospects for business purposes — sales, partnerships, recruiting, or link building.

What Makes Cold Email Different

• Recipients haven't opted in (unlike marketing email)
• Lower volume, higher personalization
• Requires dedicated infrastructure to protect your main domain
• Subject to different legal frameworks (CAN-SPAM, GDPR)

Cold Email Best Practices

• Use a separate domain — never cold email from your main business domain
• Warm up new domains/mailboxes — gradually increase sending volume over 2-4 weeks
• Authenticate everything — SPF, DKIM, DMARC on every sending domain
• Personalize the first line — reference something specific about the recipient
• Keep it short — under 150 words performs best
• Include an unsubscribe option — legally required in most jurisdictions
• Follow up 3-4 times — most replies come from follow-ups, not the first email

Cold Email Infrastructure

For cold outreach at scale, you need dedicated email infrastructure separate from your regular business email.

ColdRelay provides managed cold email infrastructure at $1 per mailbox — pre-configured with SPF, DKIM, and DMARC, and built specifically for outbound.

Email Metrics That Matter

Scaling Email Outreach With Handshake

Email is powerful for outreach, but it's just one channel. The most effective outbound strategies combine email with LinkedIn outreach — reaching prospects where they're most active.

Handshake automates LinkedIn outreach to complement your email campaigns:

• Multi-channel sequences — LinkedIn + email for maximum reach
• Personalized connection requests — scale without sacrificing quality
• Automated follow-ups — stay persistent without manual effort

Combine cold email infrastructure with LinkedIn automation for the strongest outbound system.

FAQ

What's the difference between email and Gmail?

Email is the technology. Gmail is one email provider (made by Google). Other providers include Outlook, Yahoo Mail, and ProtonMail. Gmail is the most popular with 1.8 billion users.

How many emails can I send per day?

• Gmail (free): 500/day
• Google Workspace: 2,000/day
• Outlook.com: 300/day
• Dedicated infrastructure: Thousands per day (with proper warmup)

Is email dying?

No. 4+ billion people use email. 300+ billion emails are sent daily. While messaging apps handle casual communication, email remains the universal standard for professional communication and the primary channel for B2B outreach.

What's the best free email provider?

Gmail for most people. Outlook.com if you prefer Microsoft's ecosystem. ProtonMail if privacy is your top priority.

Is cold email legal?

Yes, in most jurisdictions — with rules. CAN-SPAM (US) requires an unsubscribe link and physical address. GDPR (EU) requires legitimate interest or consent. Always include an opt-out and honor unsubscribe requests immediately.

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Email is the foundation. LinkedIn multiplies its power. Handshake automates LinkedIn outreach to complement your email strategy — helping you reach more prospects across both channels.