Email marketing is like the car my teenagers drive (and you thought there were no original analogies left!)—it’s been around for 20 years and there’s nothing flashy about it, but it’s reliable, effective, and there’s at least a 50-50 chance it will continue to do it’s job for quite some time to come.

In spite of all the abuse of the medium that’s been perpetrated over the years either maliciously (in the case of spammers) or simply as a result of ineptitude by well-meaning but ill-informed marketers, consumers and business decision makers alike continue to be willing to exchange their email addresses for the promise of valuable information on a regular basis. But both groups have become more sophisticated; more wary of subscribing in the first place, and quicker to unsubscribe if they don’t perceive value in a sender’s communications.

That means email marketers need to be more thoughtful and creative in terms of attracting subscribers, crafting email subject lines that will lead to opens and click-throughs, designing messages that are distinctive yet clear on any device, and most importantly, creating content that both provides value to the recipient and achieves organizational goals.

How can you make sure your emails avoid the spam filter and actually reach their intended recipients? What are the most effective techniques for building an opt-in email list? How can you minimize unsubscribes? What’s the best day and time to send emails? How can you craft killer subject lines that maximize open rates?

Find the answers to these questions and more here in two dozen of the best email marketing guides from the past year.

General Email Marketing Tips & Techniques

The Ultimate List of Email SPAM Trigger Words by HubSpot

The key to maximizing your email open rates is to write great subject lines, but before recipients will even see your subject lines, your messages have to get by spam filters. Karen Rubin lists nearly 400 words and phrases to avoid in subject lines in order to improve deliverability, such as “order status,” “home based,” “lowest price,” “free offer” and, of course, “Viagra.”

Email Marketing: Avoid the pitfalls of a direct-mail mindset by MarketingSherpa

Adam T. Sutton advises marketers not to treat email like direct mail, for example by avoiding segmentation: “In direct mail, segmentation is used to keep costs down…When email came along, direct mail marketers saw a bonanza. An email cost less than a penny to send. Companies stopped seeing the point in segmentation.” That’s the kind of thinking that produces spam.

10 Unsubscribe Page Best Practices by Betterment

Writing that “Catching your precious subscriber with one foot out the door isn’t the same as permanently bidding them arriverderci. Handled correctly, your unsubscribe page can actually snatch a loyal subscriber from the jaws of…whatever the opposite of that is,” Jason Amunwa lists 10 techniques to win back unsubscribers, among them giving your readers options (such as changing message frequency), letting them know you’re a person, and not using one-click unsubscribe.

Why you should measure email ROI by iMedia Connection

Mitch Lapides explains why measuring email ROI (and not just metrics like open rates) is important, how to measure it, and the four main categories of factors that can affect ROI, such as list hygiene: “a high number of inactive users—subscribers who have stopped opening your emails but haven’t unsubscribed—can hurt your email deliverability. Between 0.5 percent and 2 percent of a typical email list becomes inactive each month. And it’s not unusual to find between 30 percent and 60 percent of an email list inactive, especially if an organization hasn’t removed inactive subscribers or run a re-engagement campaign in a few years.”

Answers to Your Top 11 Questions About Email Marketing by HubSpot

Allyson Galle answers the top questions posed following a popular email webinar, such as: should emails come from the company or from an individual name (answer: it depends, test); how long should subject lines be; what constitutes a decent click-through rate; and what’s the best day and time to send emails?

7 Steps to a High-Converting Email Marketing Campaign by The Daily Egg

Sherice Jacob provides an “’email marketing campaign checklist’ of how to not only launch a profitable mailing list, but keep subscribers hungry for more,” from creating your signup form and determining the optimal placement for it on your website to personalizing email subject lines and continually testing.

12 Things About Effective Email Marketing Your Boss Expects You to Know by Polaris B

Shelley Pringle shares a dozen best practices for effective email marketing, from having a clear goal for each message (“Every marketing email you send should include a call-to-action. If there’s no link in the email, you won’t be able to track or measure your campaign, including the open rate, and more importantly, the click-through rate”) and segmenting your list to focusing on benefits and keeping your messages brief.

How to Combine Email and Social

Email and Social: A Killer Combo by ClickZ

Robin Neifield offers a dozen tips to help “integrate email and each of the major social properties,” such as, on Facebook, “Definitely use your status updates to tease upcoming emails—especially if you have an offer or promo. Provide a link so users can sign up for email if they are not already on the list.”

An inside look into the convergence of email and social by iMedia Connection

Wikus Engelbrecht offers “insights and practical tips on how to integrate and manage your cross-channel voice and leverage (email, social and mobile) in unison to get better results.” For example, create integrated messages: start by crafting “a short and sharp (email) subject line, at 50 characters or less; which should clearly state what your readers can expect from your email, what’s in it for them or what you want them to do as a result…By taking that message to the 120 character frame in Twitter, you can create more interest and clarify your call-to-action. Add a #hashtag and use a shortened URL to save on character count. A Facebook post gives you the opportunity to entice fans even more by expanding your message to 150 characters. Remove the #hashtag you used in Twitter and add a compelling graphic.”

Email Marketing Benchmarks, Facts and Statistics

Is Email Dead? Nope [INFOGRAPHIC] by eStrategy After Hours

A great infographic to share with the “email is dead / social media is the future” crowd. Among the facts David Erickson shares here: three times as many people have email accounts as are on Facebook, and compared to Twitter the ratio is ten to one. There are 60 million Facebook posts each day—but 188 billion email messages sent. Email volume continues to grow, and more than half of marketers still say that email is popular in business.

Marketer Concern: Email Hit By Problems, Inbox Rates Drop by MediaPost

Gavin O’Malley reports that less than four out of five marketing emails actually make it to the recipient’s inbox, and the rate is trending downward. He also explains why more messages are ending up in spam folders and what marketers can do to improve their deliverability rates.

Email Campaign Volumes Surge, Open Rates Stronger by MarketingProfs

Research from Epsilon shows that average email open rates increased in the past year,  while typical click-through rates fell slightly (from 5.5% to 5.2%). Among other findings: messages from banks and general retailers garner the highest average open rates (34%-36%), while emails from consumer publishers and apparel retailers are most likely to be ignored. By type, service-related emails have the highest open rate (46%) while editorial emails average 33% and marketing messages just 20%.

Infographic: Email open rates by time of day by MarketingSherpa

David Kirkpatrick shares an infographic that breaks down common patterns in email open and click-through rates to try to identify the best time to send emails. Among the findings: emails are most likely to be opened between 8:00 and 9:00 a.m. and again between 3:00 and 4:00 p.m. Also, nearly a quarter of all commercial emails are opened within one hour after sending. After 24 hours, the open rate is near zero.

B2B Email Marketing Best-Practices and Trends by MarketingProfs

According to a study by Pardot, only 30% of B2B marketers use email as a primary lead generation tactic; most consider email to be a more valuable tool for lead nurturing. The majority of B2B marketers (65%) spend less than 25% of their budgets on email. Tuesday is generally viewed as the best day for sending B2B emails, and Friday the worst. And there’s more.

Email List Building Tips

25 Clever Ways to Grow Your Email Marketing List by HubSpot

Constantly adding new names to your subscriber list is crucial, because as Andrew Pitre reports, “your email marketing database degrades by about 25% every year. Your contacts’ email addresses change as they move from one company to another, they opt-out of your email communication, or they abandon that old AOL address they only use to fill out forms on websites.” He then offers more than two dozen tips to help keep your list growing, from QR codes and online contests to ebooks and videos.

5 Ways to Generate More Email Sign Ups by Duct Tape Marketing

John Jantsch steps through five tactics by building an email list, such as feature with content: “Many WordPress theme frameworks today (Genesis and Thesis) allow for what are being called ‘feature boxes.’ These feature boxes make it easy to place a sign up box at, say, the end of each blog post or top of your blog home page. Placing your email offer where people are reading and enjoy your content improves uptake.”

Email Tips for Lead Nurturing

6 Lead Nurturing Emails Every Business Should Send by HubSpot

Corey Eridon advises that “If you’re interested in starting or improving upon your existing lead nurturing campaigns, make sure you incorporate these 6 types of emails into your lead nurturing mix to help move your leads swiftly through the sales funnel,” including emails that are personal, that educate, and that help recipients improve some aspect of their lives.

7 Critical Things Every Lead Nurturing Email Needs to Communicate by HubSpot

Noting that “The idea behind lead nurturing is to provide your leads with valuable content that targets their needs and goals in order to guide them through your buying cycle until they are sales-ready,” Sarah Goliger serves up seven tips for more effective nurturing emails, from communicating to your prospects based on information you already know about them to putting the emphasis on helping your prospects—not yourself.

Email Design Tips

It’s Not You, It’s Outlook – The Complete Guide for Email Marketers by VerticalResponse Marketing Blog

Noting that Outlook has numerous problems rendering HTML emails properly–“If you’re an email marketer… you’ve probably encountered some form of Outlook error. Your email looks pristine on your shiny iPhone, Android device, or web-based email client, but suddenly blows up when you open it up in Outlook”–this post details HTML elements that Outlook does not support, and provides recommendations for work-arounds.

Creating Emails That Pop: Basics of Design & Layout by Litmus

Lauren Smith reviews the basics of email design: color, typography, layout, and device-awareness. That last consideration is easy to overlook, but “rather than focusing on creating emails that look great in one particular environment, emails should be optimized for all inboxes,” particularly since only 3% of recipients will typically bother trying to read your email on more than one device.

How to Write Awesomely Effective Email Subject Lines

14 Email Subject Line Hacks by ClickZ
***** 5 STARS

Noting that “If our email is to be read, our subject lines must save our recipients from mindless autonomy,” Brian Massey lists 14 helpful “hacks” for creating compelling subject lines, such as shock and awe (example: “Media Measurement: Science, Art or a Load of Crap”), make up words (“The Making of Twittamentary”), and metaphors and similes (“Snackable Content: Working in a Bite-Sized Future”).

The Subject Line Strategy That Gets 541% More Response by AWeber Communications

Amanda Gagnon reports on an extensive test conducted to determine which type of email subject lines (clear or creative) perform better in terms of comments, tweets, Facebook Likes, traffic and subscriptions. And the winner is…

Use web analytics to choose email subject lines by WhatCounts

Christopher S. Penn provides step-by-step instructions one how to use Google Analytics data to identify high-volume, high CTR search queries you can test as email subject lines “to see if your audience is as interested in your emails as they are in what’s bringing them to your website.” Note that you’ll need to have your Google Analytics and Google Webmaster Tools accounts linked in order for this to work.

How to Write the Perfect Subject Line [Infographic] by Litmus

Although she acknowledges that “there’s really no such thing as the perfect subject line—or, if there is, it must be hiding with Bigfoot and the Loch Ness Monster,” Justine Jordan nevertheless takes a shot at that process with this helpful infographic. Among the tips: ask questions; keep subject lines short (40 characters or less if possible); focus on being relevant, specific and timely; and always be testing.