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If the subject line of your message reads like a subject line commonly used in spam messages then your recipients (or their email filters) will likely confuse it with spam and possibly file complaints or block your future emails. So, you have to make sure that the subject line of your messages are good enough to pass the spam filters. Here are some of the tips to write a good subject line for your emails:

• Blank subject lines: While composing an email message sometimes we concentrate too much on the content and just forget to write the subject. This is a common practice and I receive many emails without a subject line. So, when there is no subject line the email has the maximum chance of going in to the spam folder. So, the first point is to enter a subject line then go for the body of the message.
• Brand name: The subject line should have your brand or the company name. Its always a good practice to enter that as the recipients will recognize it and wont just delete it or mark it as spam.
• Proper words and phrases: You should be very careful while selecting the words for your subject line. Anything that screams of  “in your face” advertising may generate spam complaints from your subscribers, even when using the double opt-in method for acquiring list members.
• Never use these terms: Using terms like URGENT!, FREE!!!, Save $, Lowest Prices, Double Your Sales, !!!, ***, $$$, etc. in your subject line  will likely be red flags to recipients.

Consider using your list name and a similar subject line each time you send a message. For example, many organizations use this format as their message’s subject line:

Weekly Newsletter: newsletter’s topic for that issue, the date.

If a recipient sees something recognizable about you in the subject line, you will likely see an increased open rate while simultaneously reducing or eliminating spam complaints.