Un saludo amable por la mañana siempre me anima.

In Spanish, singular countable nouns normally need an article or another determiner.

So:

• un saludo amable = a kind greeting
• saludo amable by itself would usually sound incomplete in a normal sentence

Just like in English you usually say a greeting, Spanish also needs un here.

Amable means kind, pleasant, or friendly.

In Spanish, adjectives often come after the noun, so:

• un saludo amable = a kind greeting

That is the most neutral and natural order.
Putting the adjective before the noun can sometimes add a more literary, emotional, or subjective tone, but un amable saludo is less common in this sentence and sounds more like a closing in a letter or email.

In standard Peninsular Spanish, por la mañana is the usual way to say in the morning.

Spanish commonly uses:

• por la mañana = in the morning
• por la tarde = in the afternoon/evening
• por la noche = at night/in the evening

A learner might expect en la mañana because of English in the morning, but por la mañana is the normal choice in Spain.

Siempre means always, and here it modifies the verb phrase me anima.

So the idea is:

• always cheers me up
• always encourages me

The structure is:

• Un saludo amable por la mañana = the thing being talked about
• siempre me anima = what it does

Spanish often places adverbs like siempre before the verb, so this word order is very natural.

Me is the indirect/object pronoun meaning me.

• anima = he/she/it encourages / cheers up
• me anima = encourages me / cheers me up

In this sentence, un saludo amable por la mañana is the subject, so it is the thing doing the action.
The person affected by that action is me.

So literally, the structure is:

• A kind greeting in the morning always cheers me up

Anima is the third-person singular present form of the verb animar.

Conjugation in the present:

• yo animo
• tú animas
• él/ella/usted anima
• nosotros animamos
• vosotros animáis
• ellos/ellas/ustedes animan

It is third-person singular because the subject is Un saludo amable, which is singular.

Not usually in a sentence like this.

Although animar is related to English animate, in everyday Spanish it often means:

• to encourage
• to cheer up
• to lift someone's spirits

So me anima here is better understood as:

• it cheers me up
• it encourages me
• it lifts my mood

It does not usually mean it animates me in normal English.

Because the whole subject is built around the singular noun saludo.

The subject is:

• Un saludo amable por la mañana

The main noun there is saludo, which is singular.
The rest, amable and por la mañana, only describe it.

So the verb must also be singular:

• Un saludo ... anima
• not animan

It can be understood mainly as part of the situation in which the greeting happens: a kind greeting in the morning.

So the most natural reading is:

• Un saludo amable por la mañana = a kind greeting in the morning

However, in a broader sense it also helps set the time context for the whole sentence. Spanish often allows this kind of phrase to feel connected to the whole idea, not just one word.

A learner should mainly understand it as modifying the greeting.

It would probably be understood, but it is less natural in Spain.

For Spanish from Spain, por la mañana is strongly preferred.

So the best choice is:

• Un saludo amable por la mañana siempre me anima.

Not as naturally.

• amable = kind, pleasant, courteous
• amistoso = friendly, in a more relationship-based sense

For a greeting, amable sounds more natural because it describes the greeting as polite or kind in tone.
Un saludo amistoso is possible, but it feels slightly less idiomatic here.

So un saludo amable is a very good choice.

Yes, Spanish allows some flexibility, though the original sentence is very natural.

Possible alternatives include:

• Un saludo amable por la mañana siempre me anima.
• Un saludo amable por la mañana me anima siempre.
• Siempre me anima un saludo amable por la mañana.

But these do not all sound equally neutral.

The original version is the most straightforward and natural for everyday Spanish.
Placing siempre before me anima is especially common and clear.