Best approach to send 0.5 million emails with lowest cost [closed]

I am from engineering background. I have to send 0.5 million emails to users. I already have email addresses of the users.

I have few confusions

  • Sending mail through sendgrid etc, do I need to buy subscription which can hold 0.5 contacts?

  • I want to send via API, is there any API only approach?

  • What if I send via gmail SMTP?

Any kind of information is highly appreciated.

What does it cost to craft a Hell-knight plate with “Easily Worked” steel?

I have problems calculating the costs for a Hell-knight plate which is crafted based upon the Pathfinder Unchained Rules and using a special raw material (Easily Worked steel).

A Hell-knight plate costs 2000 gp off the shelf, the weight is 50 pounds.

The Unchained Rules state, that you have to “acquire raw materials whose value is equal to 1/4 the cost of the item or items you wish to craft”, in this case 500 gp.

The price per pound for Easily Worked steel is given in the table “Special Raw Material Costs”: 8 gp for use as trade good, or 4 gp for use in crafting.

Following the line of reasoning provided in another answer on this platform regarding the use of special raw materials, one can apply the 4 gp/pound as price for the acquisition of the needed special raw material.

As the armor weighs 50 pounds, this would result in (special) raw material costs of 200 gp. But this is much less than the costs for “regular” raw material (500 gp). I would assume, that using higher quality raw material would result in higher costs.

What is the correct way to calculate the costs using “Easily Worked” steel?

Does using an arcane focus reduce the cost of adding a spell to your spellbook?

The material explanation in chapter 10 of the Players Handbook states that:

‘A character can use a component pouch or a spellcasting focus in place of the components specified for a spell. But if a cost is indicated for a component, a character must have that specified component before he or she can cast the spell.

However in the Wizard class section it says that:

‘When you find a wizard scroll of 1st level or higher you can add it to your spellbook if it is of a spell level you can prepare and if you can spare the time to decipher and copy it. Copying that spell involves reproducing the basic form of the spell, then deciphering the unique system of notation used by the wizard who wrote it….etc,etc. For each level of the spell the process takes 2 hours and costs 50 gp. The cost represents the material components you expend as you experiment with the spell to master it, as well as the fine inks you need to record it.’

However immediately after that it states that copying a spell from your own book costs only 10 gp, which I assume constitutes the cost of the fine inks, therefore if you don’t have to expend the material components via using an arcane focus, does copying another wizards spells into your own spellbook still cost 50 gp per level, or just 10 gp per level for the fine inks.

If so would this also apply for a materials pouch?

Lingering Composition: Does a Performance critical failure cost the Focus point?

TL;DR: The bard player is arguing that lingering composition is a Performance check, and another player is stating it’s Casting a Spell (Focus spell).

I have a player playing a polymath bard with lingering composition.

This player insists that when casting the composition Focus spell, on the composition’s Performance check, a critical failure is the same as a failure, and the bard doesn’t expend the Focus point (because the Focus spell requires a Performance check to determine duration, and lingering composition doesn’t have a critical failure entry, only a failure entry).

My ruling as GM is that the bard is casting a Focus spell, and that the Casting a Spell rule is the active component, not the Performance check.

Lingering Composition:

Casting a Focus Spell:

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Stretegy to find the min expected cost on a series graph with edge probability pi and search cost ci

In a series graph, each edge $ e_i$ exists with probability $ p_i$ . And if you want to examine the existence of edge $ e_i$ , it will cost you $ c_i$ . I want to test the connectivity between source $ s$ and destination $ d$ with the minimum expexted cost.

I have figured out that the expected cost can be caculated below if the edge detection sequence is $ e_1, e_2, \cdots e_n$ :

$ $ E(cost) = c_1 + p_1 * (c_2 + p_2 * (c_3 + p_3 * (\cdots (c_{n-1} + p_{n-1} * c_n)\cdots))))$ $

So is there a stretegy or algorithm to find out the minimum expected cost and the edge detection sequence?

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What is the action-economy cost of drawing a weapon? What about two?

What does it take to draw a weapon if you start combat with it away? Is it an Interact? If so, you trigger Reactions including Attack of Opportunity. Part of a Stride (as it was in P1e)? Free? What if you have two weapons; can you draw both or are they separate actions?

While Interact seems like the most likely, I can’t seem to find the by-the-book answer to this.

What can cause low cost and high runtime in EXPLAIN ANALYZE?

I have a database that pretty consistently runs queries in a magnitude of cost/10 ms. There are a couple queries where EXPLAIN ANALYZE reports a cost of 2000 (which I’d expect to be somewhere in the ballpark of 200ms) but runs take multiple minutes.

My first thought is that some other activity is bogging down postgres causing this (either other processes on the machine or concurrent database activity). Is there anything else I should be looking into? Am I mistaken to expect similar cost:time ratios for different queries?

Minimum Cost Tree From Leaf Values solution explanation needed

I’m trying to understand the solution for the question posted here:

One of the solutions is to find the minimum leaf node, add the product with its smaller neighbor and remove it from the array and continue the same way until array size is one.

here is the link for the solution:

What is the result binary tree? why is it working..


How much would it cost to craft a wand of scorching ray?

I am planning to craft a wand of scorching ray for my imp familiar. Currently, I am a level 3 warlock//rogue. Since by the book this is not an item that exists, I wanted to get the accurate price for my DM.

Crafting wand: You can create a wand of any 4th-level or lower spell that you know. Crafting a wand takes one day for each 1,000 gp in its base price. The base price of a wand is its caster level × the spell level × 750 gp. To craft a wand, you must spend 1/25 of this base price in XP and use up raw materials costing one-half of this base price. A newly created wand has 50 charges.


Scorching ray (Sor/Wiz level 2): You blast your enemies with fiery rays. You may fire one ray, plus one additional ray for every four levels beyond 3rd (to a maximum of three rays at 11th level). Each ray requires a ranged touch attack to hit and deals 4d6 points of fire damage. The rays may be fired at the same or different targets, but all bolts must be aimed at targets within 30 feet of each other and fired simultaneously.

Following this, how do I calculate the price of wand of scorching ray for each variant (one ray, two rays, three rays)?