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Email etiquette refers to the set of professional guidelines and social conventions that govern how emails should be written, formatted, and sent. Good email etiquette includes using clear subject lines, proper greetings, concise messaging, appropriate tone, and timely responses. Following these practices increases the likelihood of your emails being read and responded to while reducing the risk of being marked as spam.
Email etiquette directly influences whether your messages achieve their goals. Studies show that professionals receive over 120 emails daily on average, meaning your message competes for attention in a crowded inbox. Emails that demonstrate good etiquette stand out as worth reading—they signal respect for the recipient and professionalism from the sender. For marketers and sales professionals, etiquette impacts deliverability and response rates. Emails perceived as spam-like due to poor etiquette trigger negative signals: recipients delete without reading, mark as spam, or unsubscribe. These actions damage sender reputation over time, making future emails more likely to land in spam folders. Conversely, well-crafted emails generate opens, clicks, and replies that build positive reputation. Beyond individual messages, email etiquette shapes professional relationships and brand perception. A company known for sending courteous, well-written emails builds trust and credibility. Poor email practices—sending at inappropriate hours, ignoring replies, or using aggressive tactics—erode relationships and can damage brand reputation in ways that extend beyond email channels.
Email etiquette functions as a framework of best practices that help your messages achieve their intended purpose while maintaining professionalism. At its core, good etiquette involves crafting messages that respect the recipient's time and attention through clear structure, relevant content, and appropriate formatting. The mechanics of email etiquette span multiple elements of your message. Subject lines should accurately preview content and compel opens without resorting to clickbait. The opening greeting sets the tone—too casual may seem unprofessional, while overly formal can create distance. The body should present information logically with proper paragraph breaks, avoiding walls of text that overwhelm readers. Signatures provide necessary contact information and reinforce your professional identity. From a deliverability perspective, email etiquette directly impacts how mailbox providers and recipients perceive your messages. Emails with poor etiquette—all caps subject lines, excessive exclamation marks, missing personalization, or aggressive language—trigger spam filters and human spam reports alike. Recipients who consistently experience good etiquette from a sender are more likely to engage, which signals to ISPs that future messages should reach the inbox.
Poor email etiquette triggers spam filters and negative recipient actions. Emails with all caps subject lines, excessive exclamation marks, or aggressive language are more likely to be filtered as spam. When recipients mark poorly-written emails as spam or delete without reading, it damages sender reputation and reduces future inbox placement rates.
Common mistakes include vague or misleading subject lines, overly long messages without clear structure, replying all unnecessarily, using inappropriate tone for the context, neglecting to proofread, and sending at inappropriate times. Other issues include missing greetings or sign-offs, burying important information, and failing to respond to emails in a timely manner.
Formality depends on your relationship with the recipient and industry norms. Initial contact with new connections should err toward professional formality. As relationships develop, tone can become more conversational while maintaining professionalism. When uncertain, slightly more formal is safer than overly casual, which can be perceived as disrespectful.
Marketing emails follow similar principles but with additional considerations. They must comply with regulations like CAN-SPAM, include unsubscribe options, and clearly identify the sender. Personalization, value-focused content, and mobile-friendly formatting become especially important. However, core etiquette principles—clarity, respect for readers, and professional presentation—apply to both contexts.
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